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Chessie System Diesel Roster (All Time)

Last revised: September 17, 2026

By: Adam Burns

The Chessie System, formed in 1973 as a holding company for the Chesapeake & Ohio, Baltimore & Ohio, and Western Maryland, was one of the East’s most vibrant rail empires. Chessie itself owned no equipment—locomotives stayed on the books of the subsidiaries, with C&O, B&O, or WM reporting marks—but the system unified operations across about 11,700 route-miles, hauling coal from Appalachia to the Great Lakes and Tidewater. Its diesel roster, inherited from the three roads and bolstered by new orders in the 1970s and early 1980s, was a diverse, reliable fleet that lasted until the names dissolved into CSX Transportation in 1986–87. The holding company is the Chessie System page. C&O and B&O all-time lists are the C&O diesel roster and the B&O diesel roster. This page is the combined Chessie-era fleet.

What made the roster instantly recognizable was the Chessie System paint, introduced in 1972: Federal Yellow carbodies, Enchantment Blue roofs and skirting, and Vermillion stripes, with the sleeping kitten Chessie inside a stylized C. This high-visibility livery turned everyday Geeps and SDs into rolling billboards, a far cry from the predecessors’ somber colors. The first locomotive in the scheme was B&O GP40-2 1977, outshopped at La Grange in August 1972 for the B&O’s approaching 150th anniversary.

At its peak around 1980 the Chessie diesel fleet numbered about 2,100 locomotives—roughly 1,000 C&O, 1,000 B&O, and 100 Western Maryland—dominated by Electro-Motive with a healthy General Electric contingent and a handful of Alco and Baldwin holdovers. First-generation road-switchers formed the backbone. More than 600 GP7s and GP9s (primarily C&O and B&O) handled locals and secondary freights, while about 200 GP30s and GP35s provided mid-range power. Switchers included nearly 150 NW2s and more than 100 SW7s and SW9s for yard and industrial work, supplemented by Alco S-2s and S-4s (70-plus units) and a few Baldwin VO-1000s. Older six-axle units—B&O’s fourteen SD7s and SD9s, C&O’s nineteen SD18s (the largest single-road SD18 fleet; Duluth, Missabe & Iron Range had eighteen), and about forty Chessie SD35s—tackled heavy drag service before gradual retirement.

Second-generation power defined Chessie’s modern era. About 130 GP38s, plus a handful of GP38-2s including Chicago South Shore & South Bend 2000–2009, and well over 500 GP40s and GP40-2s became the system standard for manifest and priority trains. C&O’s U-boat fleet added variety: 30 U23Bs, 38 U25Bs, and 48 U30Bs and U30Cs. C&O sampled four Alco C-630s (2100–2103), sold in 1974; Western Maryland’s remaining Alcos were RS-3s and switchers. Slugs rebuilt from retired Alco and Baldwin switchers (including WM 138T and 139T) provided extra muscle in yards without the cost of full locomotives.

New acquisitions kept the roster fresh. Chessie-era GP40-2s—including the gold-painted B&O GM50 for Electro-Motive’s 50th anniversary and the two short-lived B&O 1977s (the first became 4100; the second, 4163, wore 1977 for a 1972 Greenbrier conference)—and later SD50s (63 units on C&O and B&O, 1984–85) were the system’s last high-horsepower six-axle push. GE’s B30-7s (64 on C&O, 8235–8298) rounded out the four-axle fleet. New locomotives in Chessie paint stopped with the summer 1984 SD50s; C&O-lettered SD50s continued into November 1985. By the early 1980s the roster had streamlined as WM lines were pruned and older units retired or rebuilt. The fleet’s strength lay in its balance: versatile EMD Geeps for everyday work, big SDs for coal drags, and GE U-boats for brute force. When CSX emerged, these colorful units—many still in Chessie paint for years—helped launch a new era. Today a handful survive in museums or excursion service, reminders of the kitten-logoed railroad that once ruled the East.

Chessie System locomotives at the Chesapeake and Ohio terminal in Russell Kentucky in January 1983 with C and O SD18 7300 at left

Chessie System power awaiting assignments at the Chesapeake & Ohio terminal in Russell, Kentucky, January 1983. C&O SD18 #7300 is at left; C&O bought nineteen (1800–1818, later 7300–7318), the largest single-road SD18 fleet. Rob Kitchen photo.

On this page: At a glance · Road-switchers · Switchers

At a glance

ItemDetail
What it isCombined Chessie-era diesel roster of C&O, B&O, and Western Maryland. The holding company owned no locomotives
MarksCO, BO, WM
Peak fleetAbout 2,100 locomotives (~1,000 C&O, ~1,000 B&O, ~100 WM)
PaintFederal Yellow carbody, Enchantment Blue roof and skirting, Vermillion stripes; kitten-C from 1972
First Chessie paintB&O GP40-2 1977, August 1972 (became 4100). Gold GM50 was the same order, roster slot 4164
Last new Chessie paintEMD SD50s, summer 1984. C&O-lettered SD50s 8624–8643 into November 1985
Last four-axle GEB30-7 8235–8298, 64 units, May 1978–May 1981
SD50s63: C&O 8553–8575, B&O 8576–8595, C&O 8624–8643
End of the namesCSX Transportation July 1, 1986. C&O into CSXT August 31, 1987
Company / all-timeChessie System · C&O diesels · B&O diesels

Road-switchers

Model TypeBuilderRoad NumberSubsidiarySerial NumberCompletion DateNotes
GP40-2EMDGM50B&O 41647365-148/1972Gold EMD 50th-anniversary paint. Later 4164, CSX 6063. See GM50
GP7EMD1502–1504C&O 5705, 5747, 576410154, 15253, 152706/1950, 10/1951–11/1951Chicago South Shore & South Bend
GP7EMD1505–1506C&O 5817, 577817038, 1528410/1952, 12/1951CSS
GP7EMD1507–1508C&O 5839, 573317286, 1728010/1952CSS
SD7EMD1827–1830B&O 761–76418683–1868611/1953Later B&O 7401–7404 before Chessie
SD9EMD1831–1838B&O 765–766, 772, 767–77120121–2012812/1954Later B&O 7405, 7406, 7412, 7407–7411
SD9EMD1839–1840B&O 773–77420451–2045212/1954Later B&O 7413–7414
GP40-2EMD1977 (1st)B&O 41007365-18/1972First Chessie paint; B&O 150th. Became 4100
GP40-2EMD1977 (2nd)B&O 41637365-158/1972Numbered 1977 for the November 1972 Greenbrier conference. Roster slot 4163
GP38-2EMD2000–2009CSS796333-1 thru 796333-101/1981Built as Chicago South Shore & South Bend 2000–2009
C-630Alco2100–2103C&O 2100–2103S-3486-01 to 0410/1967Sold Morrison-Knudsen 1974; Robe River 9417–9420
U23BGE2300–2329C&O 2300–232937228–372579/1969–10/196930 units. Blomberg trucks
GP30EMD3000–3015C&O 3000–301527798–27799, 27584–275978/1962–12/1962
GP30EMD3016–3047C&O 3016–304728410–28411, 28494–285238/1963, 10/19633045 and 3047 wrecked; replaced by GP35s 3583–3584
U30CGE3300–3303C&O 3300–330336300–363036/1967
U30CGE3304–3312C&O 3304–331236767–367755/1968–7/1968
GP35EMD3500–3519B&O 3500–351929090–291093/1964–4/1964
GP35EMD3520–3539C&O 3520–353929110–291294/1964–6/1964
GP35EMD3540–3559B&O 3540–355929372–293917/1964–9/1964
GP35EMD3560–3575C&O 3560–357529392–294079/1964–11/1964
GP35EMD3576–3580WM 501–50528849–2885311/1963
GP35EMD3581B&O 35813126212/1965
GP35EMD3582C&O 35823143912/1965
GP35EMD3583–3584C&O 3045, 304730987–309889/1965Replaced wrecked GP30s 3045 and 3047
GP40EMD3684–3699B&O 3684–369932644–3265911/1966
GP40EMD3700–3739B&O 3700–373934823–348622/1969–4/1969
GP40EMD3740–3764B&O 3740–376436721–367452/1971–3/1971
GP40EMD3765–3779B&O 3765–377937189–372032/1971–3/1971
GP40EMD3780–3794C&O 3780–379439246–3926012/1971
GP40EMD3795–3799WM 3795–379937886–378908/1971
GP38EMD3800–3849B&O 3800–384933318–3336710/1967–11/1967
GP38EMD3850–3899C&O 3850–389933681–3373011/1967–12/1967
GP39EMD3900–3919C&O 3900–391934785–348045/1969–7/196920 units; C&O took nearly the entire GP39 production
GP40EMD4000–4064B&O 4000–406438480–385448/1971–10/1971
GP40EMD4065–4089C&O 4065–408938545–385695/1971–11/1971
GP40EMD4090–4099C&O 4090–409939236–3924512/1971
GP40-2EMD4101–4112B&O 4101–41127365-2 thru 7365-138/1972–9/1972Same order as 1977 (1st) and GM50
GP40-2EMD4113–4162B&O 4113–41627365-16 thru 7365-659/1972–10/1972
GP40-2EMD4165–4184C&O 4165–41847394-1 thru 7394-2011/1972First Chessie-paint C&O order
GP40-2EMD4185–4246B&O 4185–424674695-1 thru 74695-624/1975–6/1975
GP40-2EMD4247–4256B&O 4247–4256767034-1 thru 767034-102/1977
GP40-2EMD4257–4261WM 4257–4261767049-1 thru 767049-52/1977
GP40-2EMD4262–4281C&O 4262–4281776085-1 thru 776085-201/1978
GP40-2EMD4282–4286C&O 4282–4286777094-1 thru 777094-52/1978–3/1978
GP40-2EMD4287–4307B&O 4287–4307776091-1 thru 776091-211/1978–2/1978
GP40-2EMD4308–4311B&O 4308–4311777051-1 thru 777051-43/1978
GP40-2EMD4312–4321WM 4312–4321786158-1 to 786158-1011/1978
GP40-2EMD4322–4351B&O 4322–4351787227-1 thru 787227-302/1979–3/1979
GP40-2EMD4352–4371WM 4352–4371787172-1 thru 787172-201/1979–3/1979
GP40-2EMD4372–4391C&O 4372–4391786288-1 thru 786288-202/1980–3/1980
GP40-2EMD4392–4421C&O 4392–4421787289-1 thru 787289-302/1980
GP40-2EMD4422–4447B&O 4422–4447807014-1 thru 807014-265/1981–6/1981Last Chessie GP40-2s; 4447 was the last
GP38EMD4800–4819B&O 4800–481936676–366958/1970–12/1970
GP38EMD4820–4829C&O 4820–482936666–366757/1970–8/1970
GP7EMD5601–5608, 5612B&O 5601–5608, 561217500–17507, 175111/1953Built as B&O 911–918, 922
GP7EMD5613–5624B&O 5613–562418694–187059/1953Built as B&O 720–731
GP7EMD5632–5635WM 5632–563511228–112314/1950Built as WM 20–23
GP7EMD5701, 5704, 5707–5709, 5715, 5719C&O 5701, 5704, 5707–5709, 5715, 571910129, 10132, 10136–10139, 101436/1950
GP7EMD5713–5714C&O 5713–571410535, 105363/1950
GP7GMD5730–5738C&O 5730–5738A164–A169, A239–A2414/1951–6/1951
GP7EMD5739–5795C&O 5739–579515245–1530110/1951–1/1952
GP7EMD5800, 5802, 5804–5806, 5811C&O 5800, 5802, 5804–5806, 581116692, 16694, 16696–16699, 167035/1952–6/1952
GP7EMD5812–5813, 5815, 5818–5822, 5824–5828C&O 5812–5813, 5815, 5818–5822, 5824–582817033–17034, 17036, 17039–17043, 17045–1704910/1952–11/1952
GP7EMD5831, 5834, 5836–5842, 5844–5846, 5850–5851, 5853–5854C&O 5831, 5834, 5836–5842, 5844–5846, 5850–5851, 5853–585417278, 17281, 17283–17285, 17289–17291, 17294–17296, 17300–17301, 17303–1730410/1952–2/1953
GP7EMD5856–5857, 5859–5860, 5862–5868, 5870–5873, 5875–5879, 5882–5894C&O 5856–5857, 5859–5860, 5862–5868, 5870–5873, 5875–5879, 5882–589418077, 18078, 18080, 18060–18061, 18036–18042, 18044–18047, 18049–18053, 18056–18059, 18065–180734/1953–5/1953
GP9EMD5901–5917C&O 5901–591720183–2019912/1954
GP9EMD5920, 5922–5923, 5925, 5931C&O 5920, 5922–5923, 5925, 593121193, 21195–21196, 21198, 2064812/1955, 8/1955
GP9EMD5921, 5926, 5928, 5930, 5932C&O 5921, 5926, 5928, 5930, 593221194, 21199, 21201, 20647, 2064912/1955; 8/1955
GP9EMD5933WM 5933206508/1955Built as C&O 5933
GP9EMD5934–5937, 5939B&O 5934–5937, 593920651–20654, 208488/1955Built as C&O 5934–5937, 5939
GP9EMD5940–5941, 5944WM 5940–5941, 594420849–20850, 208538/1955Built as C&O 5940–5941, 5944
GP9EMD5943, 5945–5950B&O 5943, 5945–595020852, 20854–208598/1955–9/1955Built as C&O 5943, 5945–5950
GP9EMD5951–5956WM 5951–595620860–208659/1955Built as C&O 5951–5956
GP9EMD5957–5962, 5964–5968B&O 5957–5962, 5964–596820866–20871, 20873–208779/1955–10/1955Built as C&O 5957–5962, 5964–5968
GP9EMD5970–5979B&O 5970–597920879–20886, 21026–2102710/1955Built as C&O 5970–5979
GP9EMD5980–5983B&O 5980–598321028–2103110/1955Built as C&O 5980–5983
GP9EMD5984–5987C&O 5984–598721032–2103510/1955
GP9EMD5989–5999C&O 5989–599921037–21045, 21182–2118311/1955–12/1955
GP9EMD6000–6001, 6003–6007C&O 6000–6001, 6003–600721184–21185, 21187–2119212/1955
GP9EMD6009–6024C&O 6009–602421487–215023/1956
GP9EMD6030–6058C&O 6030–605821508–21511, 21524–21538, 21686–216953/1956, 4/1956, 6/1956
GP9EMD6060–6099C&O 6060–609921697–21719, 21720–21725, 22090–221006/1956
GP9EMD6135–6150C&O 6135–615022043–220589/1956–11/1956
GP9EMD6152–6193C&O 6152–619322060–22066, 22540–22547, 22550–2257611/1956–12/1956
GP9EMD6195–6208C&O 6195–620822578–2259111/1956–12/1956
GP9EMD6209–6250C&O 6209–625023368–23397, 23501–235126/1957–8/1957
GP9EMD6251–6263C&O 6251–626323513–235258/1957
GP9EMD6400–6420WM 6400–642019548–19551, 20355–20356, 20887–20888, 20664, 21619–21620, 22067, 22425–22426, 23270–23271, 23906–239105/1954–1957Built as WM 25–45. 33 was demonstrator 7257
GP9EMD6425–6446B&O 6425–644620429–20444, 20423–204284/1955–5/1955Built as B&O 675–696
GP9EMD6447–6510B&O 6447–651022191–222548/1956–10/1956
GP9EMD6511–6570B&O 6511–657022985–230445/1957–7/1957
GP9EMD6571B&O 6571236415/1957
GP9EMD6572–6598B&O 6572–659824356–243821/1958–2/1958
GP9EMD6600–6605B&O 6600–660520417–204224/1955Ex-B&O 3407–3412; built as B&O 747–752
GP9EMD6606–6611B&O 6606–661122255–2226010/1956Built as B&O 3413–3418
GP9EMD6612–6618B&O 6612–661822418–2242410/1956Built as B&O 3419–3425
GP9EMD6650–6658B&O 6650–665822101–221097/1956Built as B&O 6100–6108
GP9EMD6659–6673, 6675–6680, 6682B&O 6659–6673, 6675–6680, 668222017–22019, 22035–22040, 220419/1956
GP30EMD6900–6972B&O 6900–697227617–2768910/1962–12/1962
GP30EMD6973–6976B&O 6973–697627690–276931/1963
BL2EMD7171–7172WM 7171–71725921–592210/1948Built as WM 81–82
SD18EMD7300–7318C&O 1800–181827598–276161/1963–3/196319 units. Photo: #7300 Russell
SD35EMD7400–7419B&O 7400–741929408–294277/1964–10/1964
SD35EMD7420–7431C&O 7420–743129428–294399/1964–11/1964
SD35EMD7425 (2nd), 7428 (2nd)C&O 7425, 742830741, 307408/1965Wreck replacements
SD35EMD7432–7436WM 7432–743629890–2989412/1964
SD35EMD7437–7440B&O 7437–744030706–307099/1965
SD40EMD7500B&O 7500347784/1969
SD40EMD7501–7506C&O 7501–750634779–347844/1969Second use of the 7500s (F7Bs were first)
SD40EMD7507–7516C&O 7507–751636696–367056/1970–7/1970
SD40EMD7517–7526C&O 7517–752636746–367556/1970–7/1970
SD40EMD7527–7536C&O 7527–753637204–372133/1971
SD40EMD7545–7549WM 7545–754934967–349716/1969–7/1969Built as WM 7445–7449
SD40EMD7550–7569C&O 7450–746931929–319487/1966–8/1966
SD40EMD7570–7574WM 7570–757432134–321388/1966Built as WM 7470–7474
SD40EMD7575–7581C&O 7475–748133154–331605/1967–6/1967
SD40EMD7591–7594B&O 7491–749433170–331735/1967
SD40EMD7595–7596WM 7595–759634104, 3410511/1968Built as WM 7495–7496
SD40EMD7597–7599B&O 7597–759934775–347774/1969Built as B&O 7497–7499
SD40-2EMD7600–7609B&O 7600–7609767033-1 thru 767033-101/1977–2/1977
SD40-2EMD7610–7619B&O 7610–7619767033-11 thru 767033-202/1977
SD20-2EMD7700–7704B&O 7401, 7403–7406—1981Rebuilt from B&O SD35s; derated to 2,000 hp
U25BGE8100–8104C&O 8100–810434566–34567, 34569–34570, 345688/1963Built as C&O 2500–2504
U25BGE8105–8137C&O 8105–813734724–34726, 34731–347608/1963–1/1964Built as C&O 2505–2537
U30BGE8200–8209C&O 8200–820938218–3822712/1971–1/1972
U30BGE8210–8222C&O 8210–822238475–3848711/1972–12/1972
U30BGE8223–8224C&O 8223–822435881, 358805/1966Former GE demonstrators 302, 301
U30BGE8225–8234C&O 8225–823440068–4007712/1974
B30-7GE8235–8298C&O 8235–829841897–41906, 42138–42147, 42279–42288, 42770–42783, 43256–432755/1978–5/198164 units. Photo: #8281 Eagle Rock
SD50EMD8553–8575C&O 8553–8575837057-1 thru 837057-231/1984–2/1984Last new Chessie paint on this batch, summer 1984
SD50EMD8576–8595B&O 8576–8595837081-1 thru 837081-207/1984–8/1984
SD50EMD8624–8643C&O 8624–8643857095-1 thru 857095-2010/1985–11/1985Last new C&O-lettered locomotives
Chesapeake and Ohio B30-7 8281 leading a westbound manifest into the siding at Eagle Rock Virginia in October 1983

A westbound Chesapeake & Ohio manifest enters the siding at Eagle Rock, Virginia, led by B30-7 #8281, October 1983. C&O bought sixty-four, 8235–8298, from 1978 to 1981. Rob Kitchen photo.

Switchers

Yard rows below are Chessie-era survivors, not a complete C&O or B&O switcher dump. TR3 sets are the Herd (A-B-C), later 9552–9557. TR4 cow-calf sets later wore 9622–9625.

Model TypeBuilderRoad NumberSubsidiarySerial NumberCompletion DateNotes
SlugAlco138TWM 138T694797/1941Rebuilt from Western Maryland S-1 #102. Later AAR Type A trucks from WM VO-1000 #130
SlugBaldwin139TWM 139T760183/1955Rebuilt from a Monongahela Railway S-12 frame; Blomberg trucks
NW2EMD5061–5065, 5069B&O 5061–5065, 506910382–10386, 103709/1949Built as C&O 5061–5065, 5069
NW2EMD5066–5068, 5070–5072C&O 5066–5068, 5070–507210367–10369, 10371–103736/1949, 8/1949
NW2EMD5074–5077, 5079B&O 5074–5077, 507910375–10378, 103808/1949Built as C&O 5074–5077, 5079
NW2EMD5200–5213C&O 5200–521310259–102729/1949
NW2EMD5277–5278, 5281, 5284, 5287, 5297–5298C&O 5277–5278, 5281, 5284, 5287, 5297–52981717–1718, 3464, 3467, 3470, 5555–55562/1943–3/1943, 11/1945–5/1946, 4/1948Ex-PM 53–54, 56, 59, 62; ex-Manistee & Northeastern 2–3
SW9EMD5081–5084C&O 5081–508411714–117174/1952
SW9EMD5093C&O 50931929912/1953
SW7EMD5214–5239C&O 5214–523910273–102981/1950–3/1950
SW9EMD5245–5265C&O 5245–526515504–1552410/1951–11/1951
SW1EMD8401B&O 840110998/1940Built as B&O 201
SW1EMD8404–8414B&O 8404–84141102–11128/1940Built as B&O 204–214
SW1EMD8416, 8418, 8421B&O 8416, 8418, 84211601, 1603, 16065/1942Built as B&OCT 216, 218, 221
S4Alco9001–9005B&O 9001–900580955–8095911/1953–12/1953Built as B&O 535–539
S4Alco9007B&O 90078096312/1953Built as B&O 541
S4Alco9008–9010B&O 9008–901081320–813224/1955Built as B&O 468–470
S4Alco9011, 9013, 9015B&O 9011, 9013, 901581323, 81325, 813274/1955Built as B&O 471, 473, 542
S4Alco9017–9018B&O 9017–901881329–813304/1955Built as B&O 544–545
S2Alco9022–9024B&O 9022–902470251–702534/1943–11/1943Built as B&O 478–480
S2Alco9027–9028B&O 9027–902871302–713034/1943Built as B&O 483–484
S2Alco9030–9031B&O 9030–903171310–7131111/1943Built as B&O 486–487
S2Alco9033–9035B&O 9033–903572069, 72711–727126/1944–7/1944Built as B&O 489–491
S2Alco9037–9039B&O 9037–903972727, 72892–728938/1944–1/1945Built as B&O 493–495
S2Alco9041, 9044, 9046B&O 9041, 9044, 904672903, 72906, 729082/1945Built as B&O 497, 500, 502
S2Alco9048–9052B&O 9048–905272912–729165/1945Built as B&O 504–508
S2Alco9054–9056B&O 9054–905676161, 76175–761768/1945–9/1948Built as B&O 510–512
S2Alco9058, 9060–9061, 9063B&O 9058, 9060–9061, 906376178, 76180–76181, 761839/1948–10/1948Built as B&O 514, 516–517, 519
S2Alco9068–9069, 9072B&O 9068–9069, 907276205, 76500, 7650311/1948Built as B&O 524–525, 528
S2Alco9075–9077B&O 9075–907776506–7650812/1948Built as B&O 531–533
S4Alco9078–9079B&O 9078–907981860–818614/1956
S4Alco9081–9089B&O 9081–908981863–818714/1956–6/1956
S4Alco9091–9093B&O 9091–909381873–818756/1956
S4Alco9095–9098B&O 9095–909881877–81879, 819716/1956
S4Alco9100B&O 9100819852/1957
S4Alco9102–9108B&O 9102–910881987–819934/1957–7/1957
S4Alco9117–9126B&O 9117–9126——Ex-C&O; see C&O diesel roster
S1Alco9151–9152, 9155B&O 9151–9152, 915572694, 72835, 7284110/1944–11/1944Built as B&O 223, 224, 227
S2Alco9160–9162, 9166, 9170–9171, 9176, 9178, 9180–9186B&O 9160–9162, 9166, 9170–9171, 9176, 9178, 9180–9186——Ex-C&O; see C&O diesel roster
SW900EMD9400–9414B&O 9400–941420384–203986/1955Built as B&O 625–639
SW900EMD9415–9429B&O 9415–942920399–204126/1955–7/1955Built as B&O 640–653
NW2EMD9500, 9504, 9506B&O 9500, 9504, 95061114, 1118, 112010/1940–11/1940Built as B&O 400, 404, 406
NW2EMD9509–9511B&OCT 9509–95111729–17311/1943Built as B&OCT 409–411
NW2EMD9512–9541B&O 9512–95416693–67121/1949–3/1949Built as B&O 560–589
NW2EMD9542–9551B&O 9542–95516673–66829/1948–11/1948Built as B&O 550–559
TR3 (Herd)EMD9552–9557C&O 6500A/B/C, 6501A/B/C10253–1025810/1949A-B-C Herd sets, not cow-calf
NW2EMD9558, 9560–9562C&O 9558, 9560–95626268, 6270–627211/1948–12/1948Built as C&O 1850, 1852–1854
NW2EMD9559, 9563–9564B&O 9559, 9563–95646269, 6273, 627411/1948–12/1948Built as C&O 1851, 1855–1856
SW9EMD590–596B&O 590–59615886–158922/1952–4/1952Built as B&OCT 9600–9606
SW1200EMD9609–9613B&O 9609–961319309–1931312/1953
SW1200EMD9614–9619, 9621B&O 9614–9619, 962123360–23365, 233675/1957
TR4 (cow-calf)EMD9622–9625C&O 6000A/B, 6001A/B11945–119486/1950

Related reading on American-Rails.com

Sources

  • Live American-Rails Chessie System diesel tables (June 2, 2026), retained as the unit grid and corrected as listed in the editor header
  • Chessie System Historical Society. Prototype information. Peak fleet about 2,100 locomotives (~1,000 C&O, ~1,000 B&O, ~100 WM)
  • The Diesel Shop. “Chesapeake & Ohio All-Time Motive Diesel Summary,” R. Craig, revised March 19, 2026. Extra 2200 South; Shaver, Carl W. Chesapeake & Ohio Diesel Review
  • The Diesel Shop. GE B30-7 production roster (John Komanesky / Extra 2200 South). C&O 8235–8298
  • Sarberenyi, Robert. EMD SD40, GP38, and GP39 original-owner lists; Alco C630 original owners (TrainWeb / jaydeet)
  • Dixon, Thomas W., Jr. Chesapeake & Ohio Railway: A Concise History And Fact Book. Clifton Forge, Va.: Chesapeake & Ohio Historical Society, 2012. Paint; Chessie name
  • Trains Magazine CSX merger family tree. Chessie System, Inc., February 26 / June 15, 1973; CSX Corporation November 1, 1980; C&O into CSXT August 31, 1987
  • American-Rails.com: Chessie System; C&O diesel roster; GM50 (serial 7365-14, later 4164 / CSX 6063); B30-7; C-630

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