Published: October 8, 2026
By: Adam Burns
The Gulf, Mobile & Ohio dieselized on a short clock. The newest steam on the predecessor Gulf, Mobile & Northern was only a dozen years old when the 1940 merger was signed, and the last revenue steam run came on October 7, 1949. Between those dates the railroad bought Alco freight cabs in quantity, a fleet of F3s, two Baldwin passenger units, and the single diesel Ingalls Shipbuilding ever finished. The second generation was EMD's: GP30s, GP35s, three kinds of GP38, and twenty-one SD40s plus the SD40 demonstrator.
The tables are the all-time road numbers, 406 of them, with the builder's serial and the order or specification beside each batch. The company history is the Gulf, Mobile & Ohio. Gulf, Mobile & Northern steam is its own page, the post-1900 roster.
An FA-FB-FA set arrives at Corinth, Mississippi, with train 58 in July 1966, on Southern Railway track from Forest Yard in Memphis. The turn was crewed with Southern men. Richard (Dick) Wallin photo.
On this page: At a glance · Passenger cabs · FA-1s, F3s, and F7s · The Ingalls 4-S · Road switchers · GP30s through SD40s · Yard switchers
| Item | Detail |
|---|---|
| Railroad | Gulf, Mobile & Ohio. Mark GMO. Company page: Gulf, Mobile & Ohio |
| This roster | 406 road numbers. E8A 100A is rebuilt B&O EA 52, counted once |
| Earliest unit | EMC boxcab 1200, built August 1935 as Baltimore & Ohio 50. On the Alton from April 1936 |
| Alco freight cabs | 55 FA-1s, 700–754, and 37 B units, B1–B37 |
| EMD cabs | 32 F3A, 4 F7A, 8 F3B, 10 F7B |
| 1963 fleet | 246 diesel locomotives, a one-year count, with 13,933 freight cars and 135 passenger cars |
| Last new power | GP38-2s 740–754, order 7351, April and August 1972 |
| Merger | Illinois Central Gulf, effective August 10, 1972. Hoods took 2200, 2500, 6000, and 9500-series numbers |
Alco, Baldwin, and Ingalls serials follow the diesel shop's Gulf, Mobile & Ohio roster, reformatted December 13, 2021. EMD order numbers, and the EMD serials where that roster and the order list differ, follow Andre Kristopans. Information compiled October 8, 2026.
The oldest diesel that reached the GM&O was an Electro-Motive boxcab. In August 1935 the Baltimore & Ohio took 1,800-horsepower No. 50, serial 532, order E127. It went to the Alton in April 1936 for the Abraham Lincoln, became GM&O 1200, and retired in 1956. It is at the Museum of Transportation in St. Louis, on the Missouri museum list.
The Alton's own E units came with the 1947 merger. EA 52 of the Baltimore & Ohio, serial 668, order E145, June 1937, had become Alton 100A and was rebuilt in March 1953 as GM&O E8A 100A, order 7504, still on serial 668. Seven E7As were numbered 100 and 101–103 with the A suffixes on the 101, 102, and 103 pairs. The Gulf, Mobile & Northern's own passenger cabs were earlier than any of those: Alco DL-107s 270 and 271 in September 1940, serials 69334 and 69335, and DL-109 272 in February 1943, serial 69991. Baldwin added the two cab units 280 and 281 in January 1947, works numbers 71580 and 71581, model DR-6-4-2000.
Alco PA-1s 290 and 291 arrived in November and December 1946, serials 74682 and 74683. No. 292 followed in September 1947, serial 74696, the Alco-GE demonstrator that had carried 1776 on the Freedom Train. On June 23, 1957, PA-1 291 was at St. Louis Union Station beside DL-109 271, E7A 102, and F3A 883-A, the photograph on the company page.
| Model | Numbers | Qty | Serial | Order | Built | Notes |
|---|---|---|---|---|---|---|
| Boxcab | 1200 | 1 | 532 | E127 | August 1935 | Built as B&O 50. To the Alton, April 1936. Retired 1956. Museum of Transportation, St. Louis |
| E8A | 100A | 1 | 668 | 7504 | March 1953 | Rebuilt from B&O EA 52, order E145, June 1937, later Alton 100A |
| E7A | 101, 101A | 2 | 1671–1672 | E490 | March 1945 | Ex-Alton. ICG 4006–4007 |
| E7A | 102, 102A, 103, 103A | 4 | 2003–2006 | E544 | March 1945 | Ex-Alton. ICG 4008–4011 |
| E7A | 100 | 1 | 3218 | E660 | May 1946 | Ex-Alton 100. ICG 4050 |
| DL-107 | 270, 271 | 2 | 69334, 69335 | DL-107 | September 1940 | Gulf, Mobile & Northern passenger cabs |
| DL-109 | 272 | 1 | 69991 | DL-109 | February 1943 | |
| DR-6-4-2000 | 280–281 | 2 | 71580–71581 | — | January 1947 | Baldwin |
| PA-1 | 290–291 | 2 | 74682–74683 | — | November–December 1946 | 291 is in the June 23, 1957 St. Louis photograph |
| PA-1 | 292 | 1 | 74696 | — | September 1947 | Ex-Alco-GE 1776, the Freedom Train locomotive |
Passenger-cab quantity in this table is 17, counting the boxcab and counting 100A once.
The freight cab of the late 1940s was the Alco FA-1. Fifty-five of them, 700–754, were on the property by January 1947, and thirty-seven boosters followed through B37, the last four of those being FB-2s of June 1955. The first three cabs and the first booster were Alco demonstrators: 1500 and 1502 became 700 and 701, and 1501 became B1. The 700s were later reused. After the FA-1s left, GP38s, GP38ACs, and GP38-2s took 701–754 as a second series.
Electro-Motive's share was a 1946–47 block of F3s and a short 1949–50 block of F7s. The F3As are thirty-two road numbers and the F7As are four: 811B, 812A, 812B, and 813A. F3A 881-B, inside the December 1946 order, leads the southbound Ann Rutledge into St. Louis Union Station on June 23, 1957, on the company page. F3A 883-A, order E857, was still in GM&O paint on a Chicago commuter in August 1978, six years after the merger. Several of the suburban cabs later worked in Boston. The serials and orders below are the Kristopans blocks.
| Model | Numbers | Qty | Serial | Order | Built | Notes |
|---|---|---|---|---|---|---|
| FA-1 | 700–701 | 2 | 73292–73293 | DL-204 | January 1946 | Ex-Alco demonstrators 1500 and 1502 |
| FA-1 | 702 | 1 | 73297 | DL-208 | January 1946 | |
| FA-1 | 721–723 | 3 | 73294–73296 | DL-208 | August 1946 | |
| FA-1 | 724–728 | 5 | 73298–73302 | DL-208 | August 1946 | 724 leads the New Albany photograph, May 1965 |
| FA-1 | 703–720 | 18 | 73303–73320 | DL-208 | May–August 1946 | |
| FA-1 | 729–754 | 26 | 73649–73674 | DL-208 | October 1946–January 1947 | |
| FB-1 | B1 | 1 | 73321 | DL-205 | January 1946 | Ex-Alco demonstrator 1501 |
| FB-1 | B2–B5 | 4 | 73322–73325 | DL-209 | January 1946 | |
| FB-1 | B6–B8 | 3 | 73682–73685 | DL-209 | March 1947 | The shop prints four serials for these three numbers. 73686 falls before B9 |
| FB-1 | B9–B24 | 16 | 73687–73702 | DL-209 | March 1947 | |
| FB-1 | B25 | 1 | 75434 | DL-209 | April 1947 | |
| FB-1 | B26–B29 | 4 | 76889–76892 | DL-209 | September 1949 | |
| FB-1 | B30–B33 | 4 | 78345–78348 | DL-209 | August 1950 | |
| FB-2 | B34–B37 | 4 | 81167–81170 | — | June 1955 | |
| F3A | 800A,B–806A,B; 880A,B–882A,B | 20 | 3586–3605 | E695 | December 1946 | 881-B leads the Ann Rutledge photograph, June 23, 1957 |
| F3A | 807A,B–810A,B; 811A | 9 | 3942–3950 | E740 | May–June 1947 | 807-B leads the Odell freight, August 15, 1965 |
| F3A | 883A–885A | 3 | 4996–4998 | E857 | June 1947 | 883-A is the Chicago commuter of March 30, 1971, and the August 1978 photograph |
| F7A | 811B; 812A,B; 813A | 4 | 7633–7636 | E1089 | September 1949 | |
| F3B | B60–B64 | 5 | 3957–3961 | E740 | May–June 1947 | |
| F3B | B80–B82 | 3 | 4999–5001 | E857 | June 1947 | |
| F7B | B65–B70 | 6 | 7637–7642 | E1089 | September 1949 | |
| F7B | B71–B74 | 4 | 12310–12313 | 6140 | July 1950 |
FA-1 quantity is 55. FB-1 quantity is 33 and FB-2 quantity is 4. F3A quantity is 32, F7A quantity is 4, F3B quantity is 8, and F7B quantity is 10.
Ingalls Shipbuilding of Pascagoula, Mississippi, laid out a catalog of diesel locomotives at the end of the war and built a single prototype, the model 4-S, in March 1946. It carried demonstrator number 1500, a turret cab, and a Superior marine engine adapted by Cooper-Bessemer. The GM&O, which served the yard, bought it in June 1946 and numbered it 1900. It spent the rest of its life mostly around Mobile, retired in 1966, and was scrapped in 1967. It is the only Ingalls diesel.
| Model | Numbers | Qty | Serial | Order | Built | Notes |
|---|---|---|---|---|---|---|
| 4-S | 1900 | 1 | — | — | March 1946 | Ingalls Shipbuilding. Demonstrator 1500. Sold to the GM&O, June 1946. Retired 1966. Scrapped 1967 |
Road switchers began with the Alton's RS-1s, 50–59, built in 1945 and 1946, and with a longer GM&O series, 1102–1117 and 1120–1127, built from 1944 into 1949. The series skips 1118 and 1119. Five more RS-1s, 1051–1055, came from the Illinois Terminal. Fourteen RS-2s, 1501–1514, followed in 1948 and 1949, and nine RS-3s, 1515–1523, from 1950 through 1952. The RS-2s and RS-3s kept their numbers onto the Illinois Central Gulf. RS-1 1120, at the Tupelo depot in May 1965, is on the company page.
| Model | Numbers | Qty | Serial | Order | Built | Notes |
|---|---|---|---|---|---|---|
| RS-1 | 50 | 1 | 74322 | — | October 1945 | Ex-Alton 50. ICG 1251 |
| RS-1 | 51–53 | 3 | 74494–74496 | — | November 1945 | Ex-Alton 51–53. ICG 1252–1254 |
| RS-1 | 54–58 | 5 | 74677–74681 | — | December 1945 | Ex-Alton 54–58. ICG 1255–1259 |
| RS-1 | 59 | 1 | 74823 | — | October 1946 | Ex-Alton 59. ICG 1260 |
| RS-1 | 1051 | 1 | 75840 | — | May 1948 | Ex-Illinois Terminal 1051. ICG 1261 |
| RS-1 | 1053 | 1 | 75839 | — | May 1948 | Ex-Illinois Terminal 1053. ICG 1263 |
| RS-1 | 1052 | 1 | 77070 | — | March 1950 | Ex-Illinois Terminal 1056. ICG 1262 |
| RS-1 | 1055 | 1 | 77069 | — | March 1950 | Ex-Illinois Terminal 1055 |
| RS-1 | 1054 | 1 | 77855 | — | March 1950 | Ex-Illinois Terminal 1054. ICG 1264 |
| RS-1 | 1102 | 1 | 71438 | — | November 1944 | ICG 1266 |
| RS-1 | 1103–1104 | 2 | 73094–73095 | — | December 1944 | ICG 1267–1268 |
| RS-1 | 1105–1107 | 3 | 73335–73337 | — | April 1945 | ICG 1269–1271 |
| RS-1 | 1108–1109 | 2 | 73573–73574 | — | May 1945 | ICG 1272–1273 |
| RS-1 | 1110 | 1 | 73752 | — | May 1945 | ICG 1274 |
| RS-1 | 1111 | 1 | 74910 | — | January 1946 | ICG 1275 |
| RS-1 | 1112 | 1 | 74911 | — | April 1946 | ICG 1276 |
| RS-1 | 1113 | 1 | 75216 | — | January 1947 | ICG 1277 |
| RS-1 | 1114–1117 | 4 | 75220–75221, 75223–75224 | — | March 1947 | ICG 1278–1281. Serial 75222 is skipped |
| RS-1 | 1120 | 1 | — | — | May 1949 | ICG 1282. The Tupelo photograph, May 1965. The shop's builder-number cell on this row matches 1123–1125 |
| RS-1 | 1121–1122 | 2 | 76624–76625 | — | January 1949 | ICG 1283–1284 |
| RS-1 | 1123–1125 | 3 | 76629–76631 | — | March 1949 | |
| RS-1 | 1126–1127 | 2 | 76796, 76798 | — | May 1949 | ICG 1288–1289 |
| RS-2 | 1501–1504 | 4 | 76236–76239 | — | December 1948 | Same numbers on the Illinois Central Gulf |
| RS-2 | 1505–1508 | 4 | 76643–76646 | — | March 1949 | Same numbers on the Illinois Central Gulf |
| RS-2 | 1509–1510 | 2 | 77415–77416 | — | September 1949 | Same numbers on the Illinois Central Gulf |
| RS-2 | 1511–1514 | 4 | 77432–77435 | — | October 1949 | Same numbers on the Illinois Central Gulf |
| RS-3 | 1515–1517 | 3 | 78072–78074 | — | July 1950 | Same numbers on the Illinois Central Gulf |
| RS-3 | 1518 | 1 | 78075 | — | July 1951 | Same number on the Illinois Central Gulf |
| RS-3 | 1519–1521 | 3 | 79249–79251 | — | October 1951 | Same numbers on the Illinois Central Gulf |
| RS-3 | 1522–1523 | 2 | 80128–80129 | — | July 1952 | Same numbers on the Illinois Central Gulf |
RS-1 quantity is 39. RS-2 quantity is 14. RS-3 quantity is 9.
The 1960s hoods rode on trade-in trucks and arrived in short, repeated orders. Thirty-one GP30s, 500–530, came from December 1962 through September 1963 on orders 7635 and 7666. Serials 27921–27924 belong to another railroad, so 517–519 pick up at 27925. Forty-eight GP35s, 601–648, followed in 1964 and 1965 on orders 7670, 7729, 7764, and 7794.
Twenty GP38s, 701–720, are order 7185, August 1969, serials 35164–35183. Thirteen GP38ACs, 721–733, are split across orders 5766, 7304, and 7388, March through December 1971. No. 727, new at Bloomington on April 3, 1971, is on the company page. Fifteen GP38-2s, 740–754, are order 7351, serials 7351-1 through 7351-15, dated April and August 1972 and ordered as GM&O locomotives. The Illinois Central Gulf merger took effect on August 10, 1972, inside that build window. They became ICG 9560–9574.
Twenty-one SD40s divide into two orders. Nos. 901–912 are 31007–31018, order 7843, March 1966, and 913–921 are 32161–32169, order 7920, September 1966. No. 902 was rebuilt in October 1966 on order 8076, reusing serial 31008. The publicity view of new SD40 906, in March 1966, is on the company page. Ahead of the production engines, EMD demonstrator 434, an SD40 built on an SD35 frame, serial 29025, order 5662, July 1964, became GM&O 950 and then ICG 6071.
| Model | Numbers | Qty | Serial | Order | Built | Notes |
|---|---|---|---|---|---|---|
| GP30 | 500–516 | 17 | 27904–27920 | 7635 | December 1962–April 1963 | ICG 2250–2266 |
| GP30 | 517–519 | 3 | 27925–27927 | 7635 | May 1963 | ICG 2267–2269 |
| GP30 | 520–530 | 11 | 28422–28432 | 7666 | August–September 1963 | ICG 2270–2272 and 2273–2279. The shop leaves 523's merger number blank |
| GP35 | 601–609 | 9 | 28442–28450 | 7670 | February–March 1964 | ICG 2500–2508 |
| GP35 | 610 | 1 | 28846 | 7670 | March 1964 | ICG 2509 |
| GP35 | 611–612 | 2 | 29299–29300 | 7670 | April 1964 | ICG 2510–2511 |
| GP35 | 613–622 | 10 | 29270–29279 | 7729 | August 1964 | ICG 2512–2520. 614 kept its GM&O number |
| GP35 | 623–624 | 2 | 29589–29590 | 7729 | September 1964 | ICG 2521–2522 |
| GP35 | 625–636 | 12 | 29746–29757 | 7764 | January–March 1965 | ICG 2523–2534 |
| GP35 | 637–648 | 12 | 30264–30275 | 7794 | August–September 1965 | ICG 2535–2544. 642 and 648 kept their GM&O numbers |
| GP38 | 701–720 | 20 | 35164–35183 | 7185 | August 1969 | Second use of the 700s. ICG 9520–9539 |
| GP38AC | 721–727 | 7 | 36079–36085 | 5766 | March–April 1971 | ICG 9540–9546. 727 is the Bloomington photograph, April 3, 1971 |
| GP38AC | 728–729 | 2 | 37451–37452 | 5766 | April 1971 | ICG 9547–9548 |
| GP38AC | 730–732 | 3 | 36086–36088 | 7304 | April 1971 | ICG 9549–9551 |
| GP38AC | 733 | 1 | 7388-1 | 7388 | December 1971 | ICG 9552 |
| GP38-2 | 740–754 | 15 | 7351-1–7351-15 | 7351 | April and August 1972 | Ordered as GM&O. ICG 9560–9574 |
| SD40 | 901–912 | 12 | 31007–31018 | 7843 | March 1966 | ICG 6050–6061. 902 rebuilt October 1966, order 8076, serial 31008 reused. 906 is the March 1966 publicity photograph |
| SD40 | 913–921 | 9 | 32161–32169 | 7920 | September 1966 | ICG 6062–6070 |
| SD40X | 950 | 1 | 29025 | 5662 | July 1964 | Ex-EMD demonstrator 434, built on an SD35 frame. ICG 6071 |
GP30 quantity is 31. GP35 quantity is 48. GP38 quantity is 20, GP38AC quantity is 13, and GP38-2 quantity is 15. SD40 quantity is 21, plus the one SD40X.
The Alton's S-2s became GM&O 10–24, fifteen switchers built in 1944 and 1945. The GM&O's own yard engines in the low 600s and the 1000s were S-1s: 661–664, serials 69386–69389, and 1001–1012, built from 1941 through 1946. No. 24 later worked for Empire Coke under the same number.
| Model | Numbers | Qty | Serial | Order | Built | Notes |
|---|---|---|---|---|---|---|
| S-2 | 10–13 | 4 | 72004–72007 | — | February 1944 | Ex-Alton 10–13. ICG 1030–1033 |
| S-2 | 14–17 | 4 | 72036–72039 | — | May 1944 | Ex-Alton 14–17. ICG 1034–1037 |
| S-2 | 18–19 | 2 | 72065–72066 | — | June 1944 | Ex-Alton 18–19. ICG 1038–1039 |
| S-2 | 20–23 | 4 | 72917–72920 | — | May 1945 | Ex-Alton 20–23. ICG 1040–1043 |
| S-2 | 24 | 1 | 73357 | — | May 1945 | Ex-Alton 24. ICG 1044. Later Empire Coke 24 |
| S-1 | 661–664 | 4 | 69386–69389 | — | December 1940 | |
| S-1 | 1001–1003 | 3 | 69518–69520 | — | April 1941 | |
| S-1 | 1004–1005 | 2 | 69932, 69949 | — | September 1942 | ICG 1053–1054 |
| S-1 | 1006–1007 | 2 | 72057–72058 | — | May 1944 | ICG 1055–1056 |
| S-1 | 1008–1009 | 2 | 74806–74807 | — | October 1946 | ICG 1057–1058 |
| S-1 | 1010–1011 | 2 | 74819–74820 | — | October 1946 | ICG 1059–1060 |
| S-1 | 1012 | 1 | 74898 | — | December 1946 | ICG 1061 |
S-2 quantity is 15. S-1 quantity is 16. Adding the 17 passenger cabs, 55 FA-1s, 37 Alco boosters, 54 EMD cabs and boosters, the Ingalls unit, 39 RS-1s, 14 RS-2s, 9 RS-3s, 31 GP30s, 48 GP35s, 48 GP38-family units, 22 six-motor units, and these 31 switchers gives 406 road numbers.
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