Baltimore & Ohio (B&O): Diesel Roster (All-Time)
Last revised: September 18, 2026
By: Adam Burns
The Baltimore & Ohio’s diesel roster started as an eclectic mix from every major builder except General Electric on the road—the railroad did own a few GE switchers—and by the 1950s was largely an Electro-Motive customer. Cab units and Geeps came in large batches. Money then ran out. Nearly ten years passed with almost no new locomotives. That changed when the Chesapeake & Ohio took control in early February 1963. C&O cash paid for GP30s, GP35s, GP38s, GP40s, GP40-2s, and the rest of the second generation. Last new locomotives to wear B&O markings were twenty SD50s, 8576–8595, out of La Grange in July–August 1984 in Chessie paint. Steam ended in 1958. The company is the Baltimore & Ohio. Steam is the steam roster. This page is the diesels.
What made the roster a railfan favorite was the same West End that had run EM-1s and Big Sixes over Sand Patch. Early EA passenger cabs, Baldwin sharks, Alco FA-2s, and then acres of F7s and Geeps in royal blue kept the photographs coming until the kitten-C arrived in 1972. Dedicated Chicago Terminal switchers sit with the parent numbers here; the terminal company is B&OCT.
Baltimore & Ohio FA-2s head east past the depot at Brunswick, Maryland, during the 1950s. American-Rails.com collection. Alco’s freight cabs were the stylish minority on a roster that otherwise belonged to Electro-Motive.
On this page: At a glance · Boxcab, 50, and the EA · FTs, F3s, F7s, FA-2s, sharks · Switchers · GP7s, GP9s, and the lean years · GP30s to SD50s · Roster: switchers · Roster: cab units · Roster: first-generation road · Roster: second generation
At a glance
| Item | Detail |
|---|---|
| Railroad | Baltimore & Ohio. Mark BO. Company Baltimore & Ohio |
| First diesel | Alco-GE-IR boxcab #1, 1925, 26th Street yard, Manhattan |
| First road diesel | EMC 1,800-hp boxcab #50, August 1935. Then EA/EB 51–56, 1937–38, for the Capitol Limited |
| Last steam | 1958. Farewell May 17, Q-4b 421. See the steam roster |
| Builders | Electro-Motive (and EMC), Alco, Baldwin, Fairbanks-Morse, Lima-Hamilton, GE switchers, one Plymouth. No GE road units as original B&O orders |
| Cab freight | FT 1942–43; F3 1947–49; F7 from 1949; Alco FA-2 / FPA-2; Baldwin RF16 sharks |
| Lean years | Almost no new power from the last GP9s of 1958 until GP30s, October 1962. C&O control February 4, 1963, paid for the rest |
| Last new | EMD SD50 8576–8595, July–August 1984. Chessie paint, B&O lettering. Order 837081 |
| Paint | Royal blue and yellow; passenger blue and gray; short-lived Sunburst circa 1963; Chessie yellow, vermilion, and blue from 1972 |
Unit lists follow the live American-Rails all-time tables, cleaned against The Diesel Shop (R. Craig; Extra 2200 South March/April and May/June 1972) and Kirkland. Serials and builder order (or Baldwin spec / FM contract) numbers are their own columns. Later B&O numbers sit in the notes. Information compiled September 18, 2026.
Boxcab, number 50, and the first streamlined diesel
The B&O collected firsts. Common-carrier charter, 1827. Air-conditioning in dining car Martha Washington, 1930. Main-line electrification on the Baltimore Belt through Howard Street Tunnel, 1895, to close the gap between the New York–Washington and Washington–Cumberland mains and to keep smoke out of downtown. Those motors lasted until 1952, when enough diesels were on hand to drop the wire.
The first diesel was a smoke ordinance as much as a motive-power decision. In 1925 an Alco-GE-Ingersoll-Rand 60-ton, 300-horsepower boxcab, B&O 1, went to work at the cramped 26th Street yard on Manhattan’s West Side. Alco did the mechanical work at Schenectady; Ingersoll-Rand supplied the engine from Phillipsburg and sold the locomotive; GE installed the electrical equipment at Erie.
In August 1935 Electro-Motive delivered 1,800-horsepower boxcab 50, serial 532, order E127. It tested on Sand Patch, pulled the Royal Blue between Washington and New York, and in April 1936 went to the Alton for the Abraham Lincoln. It became Gulf, Mobile & Ohio 1200, retired in 1956, and is at the Museum of Transportation in St. Louis. Classic Trains treats 50 with the Lackawanna SCs as among EMC’s first true diesel locomotives.
The railroad came back in 1937 for the streamlined EA. Six A units, 51–56, and six EB boosters. Elevated cab, slanted nose, two Winton 201-A engines, 1,800 horsepower. They went on the Capitol Limited. EA 51, serial 666, May 1937, was the first streamlined diesel built. It was rebuilt as E8Am 1433 in December 1953, later restored at the B&O Railroad Museum as 51. EA 52 went to the Alton. From that point the B&O was an Electro-Motive customer that still sampled Alco, Baldwin, Fairbanks-Morse, and Lima in the yards and, briefly, on the road.
Baltimore & Ohio E6A #62 leads a heavyweight passenger consist westbound over Sand Patch Grade in Pennsylvania during a fall morning in the 1950s. American-Rails.com collection. E6s followed the EAs; E7s, E8s, and four E9As finished the varnish.
FTs, covered wagons, FA-2s, and sharks
After the War Production Board eased diesel restrictions, freight cab units arrived. Six four-unit FT sets, 1942–43, started the conversion the EM-1s had postponed. F3s in 1947–49 included steam-generator passenger sets (the 82-series, later 1400s / 4637s) and a large freight group in the 113–171 odds. F7s from 1949 through 1952 filled the 180s, 230s, 240s, 260s, 280s, and 360s, later the 4400–4600s and 5400 B units. They were the B&O freight diesel of the 1950s.
A Baltimore & Ohio FA-2/FB-2/FA-2 set, led by #829, hustles freight through Maryland’s Cumberland Narrows on June 12, 1952. Photographer unknown. Odd 800s were the original Alco cab numbers; later 4000s and 4100s.
Alco sold FA-2s and FPA-2s in the odd 800s, 1950–53, later 4000–4037 / 4128–4137, with FB-2 boosters in the 5000s. Baldwin sold RF16 sharknoses, A and B, 1950–53, later 4202–4220, plus a pair of ex-EJ&E / demonstrator DR-4-4-1500s. The sharks are the RF16 type page. Neither Alco nor Baldwin displaced La Grange on the main.
Baltimore & Ohio F7A #4579, in the short-lived Sunburst livery, and F7B #5460 layover at Western Maryland’s Hagerstown Yard, Maryland, in September 1964. Roger Puta photo.
Yards: Alco, Baldwin, FM, Lima, and the EMD dip
Yard power was where the roster stayed eclectic. Alco S-1s, S-2s, and S-4s filled the 200s, 400s, and later 9000s. After 1963, dozens of C&O S-2s became B&O 9115–9144 and 9160–9184; five Lehigh Valley S-2s became 9145–9149. Baldwin VO-1000s and DS-4-4-1000s, plus five DS-4-4-1200s, covered 1943–53. Fairbanks-Morse H10-44s and H12-44s, 300s and later 9700s, and a handful of H16-44 road-switchers, were the opposed-piston minority. Lima-Hamilton, which never named its diesel models, sold 1,000- and 1,200-horsepower switchers, 320–353, later 9366–9399. Two GE 44-tonners, a 65-tonner, an 80-tonner, and a 1926 Plymouth 25-tonner rounded out the light end.
Electro-Motive switchers were the long-term fleet: SW1s 200–215 (1940) and six B&OCT SW1s in 1942, NW2s from 1940 through 1949, SW9s including eight lettered B&OCT, twenty-nine SW900s, and eight SW1200s in 1957. EMC SW #2 of December 1936, the first diesel on the Chicago Terminal, was rebuilt as SW1 199 in May 1942 and later 8422. Two TR3 Herd sets came from the C&O as 9552–9557.
GP7s, GP9s, and almost ten years of nothing new
GP7s, 1953, and GP9s, 1955–58, with a last stray in January 1962, were the freight dieselization the FTs had started. Original Geeps used 600s, 700s, and 900s, then the 5600s, 6400s, and 6500s. C&O GP9s transferred after 1963 filled 6650–6683. SD7s and SD9s, a small six-axle group including demonstrator 991 as 760 / 1826, worked the heavier jobs. Baldwin AS-16s, 890–905, later 2234–2249, and a single ex-C&O AS-616, 2250, were the last Baldwin road-switchers. Alco RSD-12s 2007–2016 were ex-C&O 6700s.
By 1958 steam was finished and the treasury was empty. GP30s 6900–6976, October 1962–January 1963, were the first new road power in years, ordered as the C&O control case closed. After February 4, 1963, the orders did not stop.
GP30s, GP40-2s, GM50, and twenty SD50s
Baltimore & Ohio E8A #1464 lays over at the Ivy City engine terminal, Washington, D.C., November 1968. “Wash Me” is written in the dirt. The unit was formerly Chesapeake & Ohio E8A #4007. Rick Burn photo. After 1963, C&O and B&O passenger cabs pooled.
Second generation was Electro-Motive. GP30s, then GP35s in the 3500s, GP38s 3800–3849 (1967) and 4800–4819 (1970), GP40s from 3684 in 1966 through the 4000s in 1971. GP40-2s from 1972 wore Chessie paint from the start: 4100s including 1977 for the railroad’s 150th anniversary and 4164 lettered GM50 for Electro-Motive’s fiftieth year, then more 4100s, 4200s, 4300s, and 4422–4447 in 1981. Six-axle: SD35 7400–7419 and 7437–7440; SD40s that wandered through 7482–7500 and 7591–7599 (some 7482–7490 went to the Jersey Central); SD40-2 7600–7619, 1977; five SD20-2 rebuilds, 7700–7704, from SD35s.
Last new B&O-lettered power was SD50 8576–8595, order 837081, July–August 1984, 3,500 horsepower as delivered. Chessie yellow, vermilion, and blue, B&O sublettering. C&O took 8553–8575 the same year and 8624–8643 in 1985. CSX Corporation already existed. The B&O name vanished into the C&O on April 30, 1987; the C&O into CSX Transportation on August 31.
B&O E9A #1455 leads eastbound train 34, a single coach, at Forest Glen, Maryland, on January 5, 1969. Cumberland–Baltimore. Roger Puta photo. Four E9As, 1454–1457, May 1955, were the last new passenger cabs.
Switchers
Later system numbers in the notes. Baldwin spec numbers are in the Order column; construction numbers are Serial. FM contracts (LD) are Order. C&O and Lehigh Valley S-2 serials follow the main table.
| Numbers | Model | Builder | Serial | Order | Built | Notes |
|---|---|---|---|---|---|---|
| 1 | Boxcab | Alco-GE-IR | — | S1484 | 1925 | 60-ton, 300 hp. 26th Street, Manhattan |
| 2 | SW / SW1 | EMC | 653 | E152 | 12/1936 | B&OCT. Rebuilt SW1 199 5/1942; later 8422 |
| 19–20 | 44-ton | GE | 30470–30471 | — | 9–10/1950 | Later 8801–8802 / 8300–8301 |
| 25 | 25-ton | Plymouth | — | — | 1/1926 | Later 8900 |
| 194 | 65-ton | GE | 18072 | — | 12/1943 | Later 8810 |
| 196–197 | H12-44 | FM | 12L774–12L775 | LD157 | 9/1953 | Later 9720–9721 |
| 198 | 80-ton | GE | 18011 | — | 9/1943 | Later 8820 |
| 200–215 | SW1 | EMD | 1098–1113 | E324 | 8–9/1940 | Later 8400–8415 |
| 216–221 | SW1 | EMD | 1601–1606 | E462 | 5–8/1942 | B&OCT. Later 8416–8421 |
| 222–223 | S1 | Alco | 70057, 72694 | — | 8–9/1944 | Later 8010–8011 / 9150–9151 |
| 224–227 | S1 | Alco | 72835–72836, 72840–72841 | S1942 | 10–11/1944 | Later 8012–8015 / 9152–9155 |
| 300–309 | H10-44 | FM | 10L86–10L95 | LD151 | 11–12/1948 | Later 9700–9709 |
| 310–319 | H12-44 | FM | 12L392–12L401 | LD103 | 2/1951 | Later 9710–9719 |
| 320–327 | 1,200-hp | Lima | 9468–9475 | 1219-12–19 | 12/1950 | Later 9376–9383 |
| 328–329 | 1,200-hp | Lima | 9476–9477 | 1219-20–21 | 1/1951 | Later 9384–9385 |
| 330–331 | 1,000-hp | Lima | 9347–9348 | 1212-3–4 | 12/1949–1/1950 | Later 9366–9367 |
| 332–337 | 1,000-hp | Lima | — | 1212-5–10 | 1–2/1950 | Later 9381–9386 |
| 338–339 | 1,000-hp | Lima | 9392–9393 | 1214-1–2 | 3/1950 | Later 9374–9375 |
| 340–343 | 1,200-hp | Lima | 9478–9481 | 1219-22–25 | 1/1951 | Later 9386–9389 |
| 344–352 | 1,200-hp | Lima | 9482–9490 | 1219-26–34 | 2/1951 | Later 9390–9398 |
| 353 | 1,200-hp | Lima | 9491 | 1219-35 | 3/1951 | Later 9399 |
| 376 | DS-4-4-1000 | Baldwin | 74778 | 1005 | 7/14/1950 | Later 9250 |
| 377–381 | DS-4-4-1000 | Baldwin | 74788–74792 | 1006–1010 | 7/14/1950 | Later 9251–9255 |
| 382–385 | DS-4-4-1000 | Baldwin | 74799–74800, 74881–74882 | 1017–1020 | 8/23–8/25/1950 | Later 9256–9259 |
| 386–399 | DS-4-4-1000 | Baldwin | 74937–74950 | 1029–1042 | 8/28–10/13/1950 | Later 9260–9273 |
| 400–408 | NW2 | EMD | 1114–1122 | E325 | 10–11/1940 | Later 9500–9508 |
| 409–411 | NW2 | EMD | 1729–1731 | E463 | 1/1943 | B&OCT. Later 9509–9511 |
| 413, 415, 421, 429 | VO-1000 | Baldwin | 67649, 67651, 70858, 71990 | 168–170, 299, 416 | 8/1943–1/1945 | Later 9221–9224 |
| 414, 416 | VO-1000 | Baldwin | 67650, 67652 | 169, 171 | 8/1943 | Later 9200–9201 |
| 417–420 | VO-1000 | Baldwin | 70112–70115 | 218–221 | 11/27–12/1/1943 | Later 9202–9205 |
| 422–427 | VO-1000 | Baldwin | 70859, 70879, 71930–71933 | 300, 320, 332–335 | 5/8–7/24/1944 | Later 9206–9211 |
| 428, 430–432 | VO-1000 | Baldwin | 71989, 71991, 71426–71427 | 415, 417–419 | 1/21–1/28/1945 | Later 9212–9215 |
| 433–437 | VO-1000 | Baldwin | 71333–71337 | 427–431 | 2/19–2/25/1945 | Later 9216–9220 |
| 438–462 | DS-4-4-1000 | Baldwin | 73839–73863 | 707–731 | 10/27–12/25/1948 | Later 9225–9249 |
| 463–467 | DS-4-4-1200 | Baldwin | 75961–75965 | 408–412 | 11/11–11/20/1953 | Later 9274–9278 |
| 468–474, 542–545 | S4 | Alco | 81320–81330 | 20961 | 4/1955 | Later 9008–9018 |
| 475–481 | S2 | Alco | 70248–70254 | S1884 | 4–11/1943 | Later 9019–9025 |
| 482–487 | S2 | Alco | 71301–71303, 71309–71311 | S1915 | 4–11/1943 | Later 9026–9031 |
| 488–492 | S2 | Alco | 76175–76184 | — | 4–7/1944 | Later 9032–9036 |
| 493–496 | S2 | Alco | 72727, 72892–72894 | S1943 | 8/1944–1/1945 | Later 9037–9040 |
| 497–508 | S2 | Alco | 72903–72909, 72912–72916 | S1943 | 2–5/1945 | Later 9041–9052 |
| 509–510 | S2 | Alco | 76160–76161 | 20243 | 8/1948 | Later 9053–9054 |
| 511–520 | S2 | Alco | 76175–76184 | 20243 | 9–10/1948 | Later 9055–9064 |
| 521–524 | S2 | Alco | 76202–76205 | 20243 | 11/1948 | Later 9065–9068 |
| 525–533 | S2 | Alco | 76500–76508 | 20243 | 11–12/1948 | Later 9069–9077 |
| 534–541 | S4 | Alco | 80954–80959, 80962–80963 | — | 11–12/1953 | Later 9000–9007. Eight units |
| 550–559 | NW2 | EMD | 6673–6682 | E1086 | 9–11/1948 | Later 9542–9551 |
| 560–589 | NW2 | EMD | 6683–6712 | E1022 | 1–5/1949 | Later 9512–9541 |
| 590–597 | SW9 | EMD | 15886–15893 | 6366 | 2–4/1952 | B&OCT. Later 9600–9607 |
| 598–603 | SW9 | EMD | 19308–19313 | 4258 | 12/1953 | Later 9608–9613 |
| 625–653 | SW900 | EMD | 20384–20412 | 4301 | 5–7/1955 | Later 9400–9428. 633 / 9408 at the museum |
| 5061–5064 | NW2 | EMD | 10382–10385 | 6023 | 9/1949 | Ex-C&O 5061–5064 |
| 5069 | NW2 | EMD | 10370 | 6021 | 6/1949 | Ex-C&O 5069 |
| 5074, 5076, 5079 | NW2 | EMD | 10375, 10377, 10380 | 6021 | 6–8/1949 | Ex-C&O |
| 5215 | SW7 | EMD | 10274 | 6075 | 1/1950 | Ex-C&O 5215 |
| 9078–9097 | S4 | Alco | 81860–81879 | 21023 | 4–6/1956 | |
| 9098–9099 | S4 | Alco | 81971–81972 | 21023 | 6/1956 | |
| 9100–9114 | S4 | Alco | 81985–81999 | 21055 | 2–8/1957 | |
| 9115–9144 | S2 | Alco | see table | — | 1949–50 | Ex-C&O 5000s |
| 9145–9149 | S2 | Alco | see table | — | 1942–49 | Ex-Lehigh Valley |
| 9160–9165, 9171–9184 | S2 | Alco | see table | — | 1949–50 | Ex-C&O 5000s |
| 9552, 9555 | TR3A | EMD | 10253, 10256 | 6018 | 7, 10/1949 | Ex-C&O 6500A, 6501A |
| 9554, 9556 | TR3B | EMD | 10254–10255 | 6018 | 7/1949 | Ex-C&O 6500B, 6500C |
| 9553, 9557 | TR3B | EMD | 10257–10258 | 6018 | 10/1949 | Ex-C&O 6501B, 6501C |
| 9614–9621 | SW1200 | EMD | 23360–23367 | 4393 | 5/1957 | |
| 9722–9726 | H12-44 | FM | 12L1089–12L1093 | LD213 | 4/1957 |
Ex-C&O S-2s 9115–9144 and 9160–9184, and ex-Lehigh Valley 9145–9149:
| B&O | Former | Serial | Built |
|---|---|---|---|
| 9115 | C&O 5026 | 77165 | 10/1949 |
| 9116 | C&O 5029 | 77798 | 10/1949 |
| 9117 | C&O 5016 | 77141 | 10/1949 |
| 9118 | C&O 5039 | 77807 | 11/1949 |
| 9119 | C&O 5017 | 77142 | 10/1949 |
| 9120 | C&O 5004 | 76783 | 6/1949 |
| 9121 | C&O 5028 | 77797 | 10/1949 |
| 9122 | C&O 5042 | 77811 | 11/1949 |
| 9123 | C&O 5043 | 77812 | 11/1949 |
| 9124 | C&O 5035 | 77803 | 11/1949 |
| 9125 | C&O 5027 | 77796 | 10/1949 |
| 9126 | C&O 5030 | 77799 | 10/1949 |
| 9127 | C&O 5037 | 77806 | 10/1949 |
| 9128 | C&O 5023 | 77148 | 10/1949 |
| 9129 | C&O 5054 | 76899 | 1/1950 |
| 9130 | C&O 5050 | 77944 | 1/1950 |
| 9131 | C&O 5044 | 77813 | 11/1949 |
| 9132 | C&O 5038 | 77807 | 10/1949 |
| 9133 | C&O 5040 | 77809 | 11/1949 |
| 9134 | C&O 5041 | 77810 | 11/1949 |
| 9135 | C&O 5001 | 76771 | 5/1949 |
| 9136 | C&O 5024 | 77149 | 10/1949 |
| 9137 | C&O 5008 | 77133 | 9/1949 |
| 9138 | C&O 5013 | 77138 | 10/1949 |
| 9139 | C&O 5002 | 77165 | 10/1949 |
| 9140 | C&O 5009 | 77134 | 9/1949 |
| 9141 | C&O 5010 | 77135 | 9/1949 |
| 9142 | C&O 5003 | 76782 | 6/1949 |
| 9143 | C&O 5007 | 77132 | 9/1949 |
| 9144 | C&O 5014 | 77139 | 10/1949 |
| 9145 | LV 150 | 69952 | 8/1942 |
| 9146 | LV 153 | 69955 | 10/1942 |
| 9147 | LV 155 | 69878 | 10/1943 |
| 9148 | LV 161 | 70068 | 10/1949 |
| 9149 | LV 162 | 70069 | 11/1949 |
| 9160 | C&O 5000 | 76770 | 5/1949 |
| 9161 | C&O 5005 | 77130 | 9/1949 |
| 9162 | C&O 5006 | 77131 | 9/1949 |
| 9163 | C&O 5011 | 77136 | 10/1949 |
| 9164 | C&O 5012 | 77137 | 10/1949 |
| 9165 | C&O 5015 | 77140 | 10/1949 |
| 9171 | C&O 5032 | 77801 | 11/1949 |
| 9172 | C&O 5033 | 77802 | 11/1949 |
| 9173 | C&O 5036 | 77805 | 10/1949 |
| 9174 | C&O 5045 | 77827 | 12/1949 |
| 9175 | C&O 5046 | 77828 | 12/1949 |
| 9176 | C&O 5047 | 77941 | 12/1949 |
| 9177 | C&O 5048 | 77942 | 12/1949 |
| 9178 | C&O 5049 | 77943 | 1/1950 |
| 9179 | C&O 5051 | 77945 | 1/1950 |
| 9180 | C&O 5052 | 76897 | 1/1950 |
| 9181 | C&O 5053 | 76898 | 1/1950 |
| 9182 | C&O 5055 | 76900 | 1/1950 |
| 9183 | C&O 5056 | 76901 | 1/1950 |
| 9184 | C&O 5057 | 76902 | 1/1950 |
Cab units
Original odd/even set numbers, then the 1400 / 2400 passenger and 4400 / 5400 freight series. EA 51 is preserved as built; 50 is at St. Louis as GM&O 1200. EA 55–56 serials 767, 800 (not the EB serials).
| Numbers | Model | Builder | Serial | Order | Built | Notes |
|---|---|---|---|---|---|---|
| 50 | Boxcab | EMC | 532 | E127 | 8/1935 | To Alton 4/1936; GM&O 1200; preserved St. Louis |
| 51 | EA | EMC | 666 | E145 | 5/1937 | Rebuilt E8Am 1433 12/1953 (order 7507). Preserved as 51 |
| 51x–56x | EB | EMC | 667, 669, 768–770, 801 | E146 | 5/1937–6/1938 | Rebuilt E8Bm 2414–2419, order 7507, 5/1953–1/1954 |
| 52 | EA | EMC | 668 | E145 | 6/1937 | To Alton |
| 52 (2nd) | E6A | EMC/EMD | 1094 | E322 | 10/1940 | |
| 53–54 | EA | EMC | 765–766 | E189 | 1/1938 | Rebuilt E8Am 1434–1435, order 7507 |
| 55–56 | EA | EMC | 767, 800 | E191 | 6/1938 | Rebuilt E8Am 1436–1437, order 7507 |
| 57–59 | E6A | EMC/EMD | 1091–1093 | E322 | 9/1940 | Later 1408–1410 |
| 57x–59x | E6B | EMC/EMD | 1095–1097 | E323 | 9/1940 | Later 2407–2409 |
| 60–63 | E6A | EMC/EMD | 1328–1331 | E388 | 6–7/1941 | Later 1411–1414 |
| 60x–63x | E6B | EMC/EMD | 1332–1335 | E389 | 6–7/1941 | Later 2410–2413 |
| 64, 64A, 66, 66A | E7A | EMD | 1673–1676 | E472 | 2/1945 | Later 1415–1418 |
| 68–80 (evens) and A units | E7A | EMD | 2897–2910 | E642 | 9–10/1945 | Later 1419–1432 |
| 82–88 (evens), 82A–86A | F3A | EMD | 4072–4078 | E757 | 7/1947 | Steam generators. Later 1400–1406 / 4637–4643 |
| 82x–84Ax | F3B | EMD | 4080–4083 | E757 | 7/1947 | Later 2400–2403 / 5520–5523 |
| 86x, 86Ax, 88x | F3B | EMD | 4135–4137 | E757 | 7/1947 | Later 2404–2406 / 5524–5526 |
| 90, 90A, 92, 92A | E8A | EMD | 10231–10234 | 2015 | 9/1950 | Later 1438–1441; 92 / 1440 became 1463 |
| 94, 94A, 96, 96A | E8A | EMD | 12712–12715 | 6162 | 9–10/1950 | Later 1442–1445 |
| 26–32 (evens) and A units | E8A | EMD | 18675–18682 | 2061 | 10/1953 | Later 1446–1453 |
| 34–40 (evens) | E9A | EMD | 20377–20380 | 2069 | 5/1955 | Later 1454–1457. Last new passenger cabs |
| 1440 (2nd) | E8A | EMD | 14765 | 2015 | 8/1951 | Ex-C&O 4006 |
| 1460–1462 | E8A | EMD | 14760, 14770, 14776 | 2040 | 8–12/1951 | Ex-C&O 4001, 4011, 4017 |
| 1464–1467 | E8A | EMD | 14766, 14768, 14771–14772 | 2040 | 8–11/1951 | Ex-C&O 4007, 4009, 4012–4013 |
| 1A–5A, 1D–5D (odds) | FTA | EMD | 1633–1638 | E470 | 8–9/1942 | Later 101–111 odds / 4400–4405 |
| 1B–5C (odds) | FTB | EMD | 1645–1650 | E471 | 8–9/1942 | Later 5400–5405 |
| 7A–11A, 7D–11D (odds) | FTA | EMD | 1639–1644 | E470 | 8–10/1943 | Later 4406–4411 |
| 7B–11C (odds) | FTB | EMD | 1651–1656 | E471 | 8–10/1943 | Later 5406–5411 |
| 113–151 (odds) and A units | F3A | EMD | 5089–5128 | E865 | 4–5/1948 | Later 4420–4459 |
| 153–171 (odds) and A units | F3A | EMD | — | E940 | 11/1948–1/1949 | Later 4460–4479. Live table repeated E865 serials |
| 153x–171x (odds) | F7B | EMD | 12283–12292 | 3069 | 9/1950 | Later 5420–5429 |
| 180–192 (evens) and A units | F7A | EMD | 7554–7567 | E1079 | 8–10/1949 | Later 4480–4493 |
| 180x–184Ax (evens) | F7B | EMD | 7568–7573 | E1079 | 8–9/1949 | Later 5430–5435 |
| 186x–192Ax (evens) | F7B | EMD | 8743–8750 | E1079 | 9/1949 | Later 5436–5443 |
| 231–243 (odds) and A units | F7A | EMD | 10221–10230 | 3034 | 8/1950 | Later 4494–4503 |
| 231x–237x (odds) | F7B | EMD | 11709–11712 | 3034 | 8/1950 | Later 5444–5447 |
| 245, 245A, 247, 247A | F7A | EMD | 11705–11708 | 3034 | 8/1950 | Later 4504–4507 |
| 249–263 (odds) and A units | F7A | EMD | 12259–12274 | 3064 | 9–10/1950 | Later 4508–4523 |
| 249x–263x (odds) | F7B | EMD | 12275–12282 | 3064 | 9–10/1950 | Later 5448–5455 |
| 265–279 (odds) and A units | F7A | EMD | 12626–12641 | 6161 | 10–12/1950 | Later 4524–4539 |
| 265x–279x (odds) | F7B | EMD | 12674–12681 | 6161 | 11–12/1950 | Later 5456–5463 |
| 281–297 (odds) and A units, 361, 361A | F7A | EMD | 12642–12661 | 6207 | 1–2/1951 | Later 4540–4559 |
| 281x–297x (odds), 361x | F7B | EMD | 12682–12691 | 6207 | 1–2/1951 | Later 5464–5473 |
| 363, 363A, 365, 365A | F7A | EMD | 12662–12665 | 6161 | 1–2/1951 | Later 4560–4563 |
| 363x–365Ax | F7B | EMD | 12692–12695 | 6161 | 12/1950–1/1951 | Later 5474–5477 |
| 367–374 | F7A | EMD | 12666–12673 | 6161 | 12/1950–1/1951 | Later 4564–4571 |
| 367x–374Ax (odds) | F7B | EMD | 12696–12711 | 6161 | 12/1950–1/1951 | Later 5478–5493 |
| 801–805 (odds) and A units | FA-2 | Alco | 78188–78193 | — | 10–11/1950 | Later 4000–4005 |
| 801x–809x (odds) | FB-2 | Alco | 78198–78200, 78502 | — | 10/1950–1/1951 | Later 5000–5003 |
| 807, 807A | FA-2 | Alco | 78266–78267 | — | 11/1950 | Later 4006–4007 |
| 809–817 (odds) and A units | FPA-2 | Alco | 78483–78492 | 20551 | 12/1950–1/1951 | Later 4008–4017 |
| 809x–817x (odds) | FB-2 | Alco | 78201, 78498–78501 | — | 12/1950–1/1951 | Later 5004–5008. Steam-generator equipped |
| 817Ax | FB-2 | Alco | 78497 | — | 1/1951 | Later 5009 |
| 819–823 (odds) and A units | FA-2 | Alco | 79710–79715 | 20774 | 1–2/1952 | Later 4018–4023 |
| 819x–823x (odds) | FB-2 | Alco | 79760–79762 | — | 1/1952 | Later 5010–5012 |
| 825–827 (odds) and A units | FA-2 | Alco | 79744–79746, 79955 | 20774 | 3/1952 | Later 4024–4027 |
| 825x–835x (odds) | FB-2 | Alco | 80010–80013, 80030–80031 | — | 4/1952, 4/1953 | Later 5013–5018 |
| 829–831 (odds) and A units | FA-2 | Alco | 79956–79959 | 20774 | 3–4/1952 | Later 4028–4031 / 4128–4131 |
| 833–837 (odds) and A units | FA-2 | Alco | 79984–79989 | 20848 | 4–5/1953 | Later 4032–4037 / 4132–4137 |
| 837x, 837Ax | FB-2 | Alco | 80032–80033 | — | 5/1953 | Later 5019–5020 |
| 847, 849 | DR-4-4-1500A | Baldwin | 73981, 73984 | 29, 30 | 6/1949 | Ex-EJ&E / demos 6001A. Acquired 3/1955. Later 4200–4201 |
| 847x, 849x | DR-4-4-1500B | Baldwin | 73982–73983 | 18–19 | 6/1949 | Ex-EJ&E / demos 6001B. Later 5200–5201 |
| 851–861 (odds) and A units | RF16A | Baldwin | 74801–74811, 74816 | 1–12 | 11/7–11/30/1950 | Later 4202–4213 |
| 863, 863A | RF16A | Baldwin | 74817–74818 | 13–14 | 12/6/1950 | Later 4214–4215 |
| 865, 865A, 867, 869, 871 | RF16A | Baldwin | 75386–75390 | 107–111 | 5/1952–5/1953 | Later 4216–4220 |
| RF16 B units | RF16B | Baldwin | 75413–75419, 75808–75813 | 40–52 | 5/1952–5/1953 | Thirteen boosters |
| 4412–4413 | FTA | EMD | 3128–3129 | E654 | 5/1945 | Ex-NYO&W 806–807 |
| 5412–5413 | FTB | EMD | 3136–3137 | E654 | 5/1945 | Ex-NYO&W 806B–807B |
| 4644–4647 | F7A | EMD | 11809–11812 | 6118 | 6/1950 | Ex-B&LE 701A–704A |
| 4648–4651 | F7A | EMD | 13678–13681 | 3085 | 2–3/1951 | Ex-B&LE 708A–711A |
| 4652–4654 | F7A | EMD | 11813–11815 | 6118 | 6/1950 | Ex-B&LE 705A–707A |
| 5527–5533 | F7B | EMD | 11816–11822 | 6118 | 2/1951 | Ex-B&LE 701B–707B |
| 5534–5537 | F7B | EMD | 13685–13688 | 3085 | 3/1951 | Ex-B&LE 708B–711B |
| 5540 | F7B | EMD | 16026 | 3097 | 2/1952 | Ex-C&O 7519 |
| 929–945 (odds) | F7A | EMD | 15905–15913 | 3122 | 1/1952 | Later 4572–4580 |
| 929A–945A (odds) | F7A | EMD | 15914–15922 | 3122 | 1/1952 | Later 4581–4589 |
| 929x–945x (odds) | F7B | EMD | 15923–15931 | 3122 | 1/1952 | Later 5494–5502 |
| 947–961 (odds) and A units | F7A | EMD | 16642–16657 | 3146 | 8/1952 | Later 4590–4605 |
| 947x–961x (odds) | F7B | EMD | 16671–16678 | 3146 | 8/1952 | Later 5503–5510 |
| 963–975 (odds) and A units | F7A | EMD | 16658–16670 | 3154 | 8/1952 | Later 4606–4618 |
| 977–993 (odds) and A units | F7A | EMD | 17512–17529 | 6467 | 1/1953 | Later 4619–4636 |
| 977x–993x (odds) | F7B | EMD | 17530–17538 | 6467 | 1/1953 | Later 5511–5519 |
First-generation road-switchers
| Numbers | Model | Builder | Serial | Order | Built | Notes |
|---|---|---|---|---|---|---|
| 675–690 | GP9 | EMD | 20429–20444 | 5393 | 4–5/1955 | Later 6425–6440 |
| 691–696 | GP9 | EMD | 20423–20428 | 5392 | 4/1955 | Later 6441–6446 |
| 720–731 | GP7 | EMD | 18694–18705 | 5301 | 9/1953 | Later 6413–6424 / 5613–5624 |
| 740–746 | GP7 | EMD | 18687–18693 | 5302 | 10/1953 | Later 3400–3406 / 6693–6699 |
| 747–752 | GP9 | EMD | 20417–20422 | 5388 | 4/1955 | Later 3417–3412 / 6600–6605 |
| 760 | SD7 | EMD | 17410 | 6457 | 3/1952 | Ex-demonstrator 991. Later 7400 / 1826 |
| 761–764 | SD7 | EMD | 18683–18686 | 5303 | 11/1953 | Later 7401–7404 / 1827–1830 |
| 765–766 | SD9 | EMD | 20121–20122 | 5376 | 12/1954 | Later 7405–7406 / 1831–1832 |
| 767–771 | SD9 | EMD | 20124–20128 | 5376 | 12/1954 | Later 7407–7411 / 1833–1837 |
| 772 | SD9 | EMD | 20123 | 5388 | 12/1954 | Later 7412 / 1838 |
| 773–774 | SD9 | EMD | 20451–20452 | 5395 | 4/1955 | Later 7413–7414 / 1839–1840 |
| 890–898 | AS-16 | Baldwin | 76096–76104 | 120–128 | 5/6–6/30/1955 | Later 6207–6216 / 2241–2249 |
| 899 | AS-16 | Baldwin | 75966 | 105 | 2/25/1954 | Later 6206 / 2240 |
| 900–904 | AS-16 | Baldwin | 75498–75502 | 60–64 | 5/27–6/3/1952 | Later 6200–6204 / 2234–2238 |
| 905 | AS-16 | Baldwin | 75420 | 92 | 3/27/1953 | Later 6205 / 2239 |
| 906–907 | H16-44 | FM | 16L697–16L698 | LD144 | 12/1952 | Later 6700–6701. Leased CNJ 18–19 |
| 910–922 | GP7 | EMD | 17499–17511 | 6294 | 1/1953 | Later 6400–6412 / 5600–5612 |
| 925–926 | H16-44 | FM | 16L961–16L962 | LD178 | 4/1955 | Later 6702–6703 / 9737–9738 |
| 927 | H16-44 | FM | 16L969 | LD178 | 4/1955 | Later 6704 / 9739 |
| 2007–2016 | RSD-12 | Alco | 81943–81952 | — | 4–5/1956 | Ex-C&O 6700–6709 |
| 2250 | AS-616 | Baldwin | 75175 | 83 | 8/3/1951 | Ex-C&O 5555 / 2219 |
| 3413–3418 | GP9 | EMD | 22255–22260 | 5490 | 8–10/1956 | Later 6606–6611 |
| 3419–3425 | GP9 | EMD | 22418–22424 | 5490 | 10/1956 | Later 6612–6618 |
| 6405 (2nd) | GP7 | EMD | 17504 | 8030 | 12/1953 | Rebuilt; no dynamic brake |
| 6447–6500 | GP9 | EMD | 22191–22244 | 5477 | 8–10/1956 | |
| 6498 (2nd) | GP9 | EMD | 23624 | 8045 | 5/1957 | |
| 6501–6510 | GP9 | EMD | 22245–22254 | 5489 | 10/1956 | |
| 6511–6562 | GP9 | EMD | 22985–23036 | 5519 | 5–7/1957 | |
| 6563–6570 | GP9 | EMD | 23037–23044 | 5543 | 7/1957 | |
| 6571 | GP9 | EMD | 23641 | 8046 | 5/1957 | Rebuilt from F-unit |
| 6572–6598 | GP9 | EMD | 24356–24382 | 5568 | 1–2/1958 | |
| 6599 | GP9 | EMD | 27086 | 7615 | 1/1962 | Last of the lean years. TrainWeb lists as GP18 rebuild from F-unit |
| 6650–6658 | GP9 | EMD | 22101–22109 | 5473 | 6–7/1956 | Ex-C&O 6100–6108 |
| 6659–6661 | GP9 | EMD | 22017–22019 | 5467 | 9/1956 | Ex-C&O 6109–6111 |
| 6662–6683 | GP9 | EMD | 22021–22042 | 5467 | 9/1956 | Ex-C&O 6113–6134 |
| 6705–6709 | H16-44 | FM | 16L1144–16L1148 | LD211 | 3/1957 | Later 9740–9743; 6709 wrecked before 9744 |
| 9185–9186 | RS-1 | Alco | 80851–80852 | 20871 | 9/1953 | Ex-C&O 5114–5115 |
Second generation
GP40-2 1977 marked the B&O’s 150th anniversary, not the national Bicentennial. 4164 is GM50. SD50s 8576–8595 were omitted from the live unit tables; they are the last new B&O-lettered locomotives. Dash-2 serials are order-unit (7365-1, etc.).
| Numbers | Model | Builder | Serial | Order | Built | Notes |
|---|---|---|---|---|---|---|
| 3500–3519 | GP35 | EMD | 29090–29109 | 7716 | 3–4/1964 | |
| 3540–3559 | GP35 | EMD | 29372–29391 | 7736 | 7–9/1964 | |
| 3581 | GP35 | EMD | 31262 | 7863 | 12/1965 | |
| 3684–3699 | GP40 | EMD | 32644–32659 | 7943 | 11/1966 | 3684 at the B&O Museum |
| 3700–3739 | GP40 | EMD | 34823–34862 | 7158 | 2–4/1969 | |
| 3740–3764 | GP40 | EMD | 36721–36745 | 7275 | 12/1970–1/1971 | |
| 3765–3777 | GP40 | EMD | 37189–37201 | 7301 | 2–3/1971 | |
| 3778–3779 | GP40 | EMD | 37202–37203 | 7317 | 3/1971 | |
| 3800–3849 | GP38 | EMD | 33318–33367 | 7060 | 10–11/1967 | |
| 3837 (2nd) | GP38 | EMD | 33335 | 8085 | 7/1971 | Wreck replacement. One unit |
| 4000–4054 | GP40 | EMD | 38480–38534 | 7340 | 8–10/1971 | |
| 4055–4064 | GP40 | EMD | 38535–38544 | 7356 | 11/1971 | |
| 4100–4162, 1977, 4164 | GP40-2 | EMD | 7365-1 thru 7365-65 | 7365 | 8–11/1972 | 1977 sesquicentennial; 4164 GM50 |
| 4185–4246 | GP40-2 | EMD | 74695-1 thru 74695-62 | 74695 | 4–7/1975 | |
| 4247–4256 | GP40-2 | EMD | 767034-1 thru 767034-10 | 767034 | 2/1977 | |
| 4287–4307 | GP40-2 | EMD | 776091-1 thru 776091-21 | 776091 | 1–2/1978 | |
| 4308–4311 | GP40-2 | EMD | 777051-1 thru 777051-4 | 777051 | 3/1978 | |
| 4322–4351 | GP40-2 | EMD | 787227-1 thru 787227-30 | 787227 | 2–3/1979 | |
| 4422–4447 | GP40-2 | EMD | 807014-1 thru 807014-26 | 807014 | 5–6/1981 | |
| 4800–4819 | GP38 | EMD | 36676–36695 | 8085 | 8–12/1970 | |
| 6900–6927 | GP30 | EMD | 27617–27644 | 7628 | 10–11/1962 | First new road power after the lean years |
| 6928–6976 | GP30 | EMD | 27645–27693 | 7631 | 11/1962–1/1963 | |
| 7400–7419 | SD35 | EMD | 29408–29427 | 7738 | 7–10/1964 | 7402 at the museum |
| 7437–7440 | SD35 | EMD | 30706–30709 | 7828 | 9/1965 | |
| 7482–7494 | SD40 | EMD | 33161–33173 | 7998 | 5/1967 | 7482–7490 to CNJ; 7491–7494 became 7591–7594 |
| 7497–7500 | SD40 | EMD | 34775–34778 | 7159 | 4/1969 | 7497–7499 became 7597–7599; 7500 kept |
| 7600–7619 | SD40-2 | EMD | 767033-1 thru 767033-20 | 767033 | 1–2/1977 | |
| 7700–7704 | SD20-2 | EMD | 29413, 29409, 29414, 29412 | 7738 | 2–3/1979 | Rebuilt from SD35s. Live listed four serials for five units |
| 8576–8595 | SD50 | EMD | 837081-1 thru 837081-20 | 837081 | 7–8/1984 | Last new B&O. Chessie paint |
Related reading on American-Rails.com
- Baltimore & Ohio · B&O steam roster · B&O passenger trains
- B&OCT · Alton · EMC EA · GP40-2 GM50
- Chesapeake & Ohio · C&O diesels · Chessie System · Chessie diesel roster · CSX
- Capitol Limited · Royal Blue · B&O Railroad Museum · Diesel locomotives
Sources
- Live American-Rails all-time B&O diesel tables (March 13, 2025), retained as the unit grid and corrected as listed above
- The Diesel Shop. “Baltimore & Ohio All-Time Diesel Roster,” R. Craig, revised September 21, 2025. Extra 2200 South (March/April 1972 and May/June 1972)
- Kirkland, John F. The Diesel Builders, volumes 1–3 (Fairbanks-Morse and Lima-Hamilton; Alco; Baldwin). Interurban Press / 1994
- Liljestrand, Robert A., and David R. Sweetland. Baltimore & Ohio Diesel Locomotives, volume 1, switchers and road-switchers
- Solomon, Brian. Electro-Motive E-Units and F-Units. Minneapolis: Voyageur Press, 2011. EA 51; boxcab 50
- TrainWeb EMD order list; American-Rails.com, EMD SD50. SD50 8576–8595 serials 837081-1 thru 837081-20, July–August 1984
- Reynolds, Kirk, and David Oroszi. Baltimore & Ohio Railroad. Osceola: MBI Publishing, 2000
- American-Rails.com: B&O company; steam roster; B&OCT (SW1 E462, 1942); Chessie diesel; EA; GM50
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Chicago and Eastern Illinois Railroad: Map, Rosters, History
Oct 19, 26 03:57 PM
The Chicago & Eastern Illinois ran from Chicago to Evansville, St. Louis, and Thebes. First company of the name, August 28, 1877. The remainder merged into the Missouri Pacific on October 15, 1976. St… -
Rock Island Diesel Roser: All-Time
Oct 19, 26 11:05 AM
Chicago, Rock Island and Pacific diesel locomotives, 1,029 frames counted once. Switchers, cab units, road-switchers, two acquired slugs, five RDCs, and bi-power 10000. Serial and order are separate c… -
Rock Island Steam Roster: Post 1900
Oct 19, 26 11:01 AM
Chicago, Rock Island and Pacific steam locomotives built or rebuilt since 1900. Drury's class grid, 1,482 frames counted once, including 85 4-8-4s. Last revenue steam was July 1953. -
Rock Island Railroad: Map, Pictures, Logo, History
Oct 19, 26 10:51 AM
The Chicago, Rock Island and Pacific ran from Chicago to the Twin Cities, Denver, Tucumcari, and the Gulf. First train October 10, 1852. Directed service ended March 23, 1980. Steam and diesel rosters… -
EMD "F7" Locomotives: Cab, Top Speed, Specs, Rosters
Oct 19, 26 12:27 AM
EMD F7 cab units and boosters, 1,500 horsepower, built February 1949 through December 1953. Gear ratios, specifications, and the production roster by owner, serial, and order. -
Harlem Transfer Company: An NYC Terminal System
Oct 19, 26 12:01 AM
Harlem Transfer Company, the Lackawanna's offline freight terminal on the Bronx side of the Harlem River at East 135th Street. Carfloats to Hoboken, boxcab No. 2, and GE 44-tonner 53. -
Belpre Industrial Parkersburg Railroad: Roster, History, Photos
Oct 18, 26 11:44 PM
Belpre Industrial Parkersburg Railroad, a Class III short line leasing about 46.9 miles of CSX track at Parkersburg since 2020. The Ohio River bridge, the Marietta Subdivision, and five GP38-3s. -
Chicago, Peoria & St. Louis Railroad: Map, Timetables, History
Oct 18, 26 10:57 PM
Chicago, Peoria & St. Louis Railroad, an Illinois line from Pekin and Peoria through Springfield to Madison. Chartered in 1853. Sold in parcels on November 20, 1924. The Pekin line is today the Illino… -
Chicago, Burlington & Quincy Diesel Roster (All-Time)
Oct 18, 26 10:54 PM
All-time diesel roster of the Chicago, Burlington & Quincy. 951 parent frames, 72 Colorado & Southern, and 36 Fort Worth & Denver, each counted once. Serials included. -
Burlington Railroad (CB&Q): Map, History, Rosters, Photos
Oct 18, 26 10:49 PM
The Chicago, Burlington & Quincy, the Burlington Route, ran from Chicago to Denver, the Twin Cities, and the Gulf. Steam built since 1900 and the diesel fleets are companion rosters. Burlington Northe…
