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GE "Super 7" Locomotives: Data, Specs, Production Roster

Last revised: January 1, 2025

By: Adam Burns

The "Super 7 Series," a name coined by Monongahela Railway president Paul Reistrup, according to Brian Solomon's book "GE Locomotives," was a rebuild program implemented during the 1980s to breathe new life into older Universal and early "Dash 7" models.

With sales ramping up for its latest "Dash 8" line, and the expense of new locomotives climbing, GE believed a rebuild series would bring in new buyers while providing them a power plant that featured the latest in electronics and components.

Interestingly, this concept was relatively new at the time; while Electro-Motive had rebuilt some older Baldwins and Alcos with EMD prime mover, and upgraded a few of its own first-generation Geeps, the company had never offered a true rebuild program of like-new locomotives.

The closest in existence then included companies such as Morrison-Knudsen and Precision National, which rebuilt a variety of first, and early second, generation locomotives from Alco and EMD.

Unfortunately, the domestic market for the Super 7s never took off, thanks largely to a saturated market of older first generation EMDs that could be acquired for a fraction of the price.  

Interestingly, Super 7s did gain a large following in Mexico where Ferrocarriles Nacionales de México acquired a large fleet of six-axle variants, the C30-S7, during the early 1990s.

Photos

Monongahela "Super 7's" layover between assignments in Brownsville, Pennsylvania on October 5, 1990; #2302 began its career as Western Pacific U23B #2252 while #2300 as Western Pacific U23B #2254. Warren Calloway photo.

Background

The Monongahela Railway was the only American line to show interest in GE's Super 7 series.  The MGA, then-owned by CSX and Conrail, was a regional coal carrier situated in north-central West Virginia and southwestern Pennsylvania.

It ultimately picked up eleven examples, #2300-2310.  In addition, Roberval & Saguenay of Ontario acquired three units.  The MGA locomotives were all former Western Pacific U23Bs while Ferrocarriles Nacionales de México's were rebuilt from former U30Cs, U33Cs, U36Cs, U36CGs, C30-7s, and C36-7s.

As Greg McDonnell notes in his book, "U-boats," former Western Pacific U23B #2263 was the chassis selected to become the original "Super 7" variant.

To keep costs down, GE reused the prime mover, 752 traction motors, trucks, and frames.  The company, however, upgraded the locomotive with a new standard comfort cab, Dash 8 specifications, modern toilet, refrigerator, and GE's SENTRY wheel-slip control system.  The company detailed this system in the following:

"The SENTRY system used traction-motor shaft speed sensors in place of older axle-mounted systems.  The motor shaft sensors were as much as six times more sensitive to speed fluctuations, allowing for more detailed corrections to wheel slip and a better application of sand to the rail. 

Depending on the severity of wheel slip, the SENTRY system would automatically sand the rail and make small, calculated reductions to motor output."

With GE's Erie plant at record capacity outshopping new Dash 8 locomotives, the company acquired the old Montreal Locomotive Works facility in Montreal, Quebec to handle new "Super 7" builds.  

Interestingly, this facility had been American Locomotive's Canadian arm and completed many classic diesels, including some models never offered in the domestic United States.  At the time, Alco and GE worked closely manufacturing locomotives, a partnership which ended during the 1950s.

Data Sheets and Specifications

B23-S7 (Super7-23B)

Entered Production3/1989 (General Electric #2000)
Years Produced3/1989 - 2/1991
GE ClassB23-S7 (Super7-23B)
Engine7FDL12 (12 cylinder)
Engine BuilderGeneral Electric
Horsepower2250
RPM1050
Length60' 2"
Height (Top Of Rail To Top Of Cab)14' 11 1/2"
Width10' 3"
Weight272,000 Lbs
Fuel Capacity2,900 Gallons
Air Compressor3CDC (Westinghouse)
Air Brake Schedule26L (Westinghouse)
TrucksB-B
Truck TypeFloating Bolster FB2 (GE)
Truck Wheelbase9' 4"
Wheel Size40"
Traction Motors752 (4), GE
Traction AlternatorGTA11 (AC), GE
Auxiliary GeneratorGY27, GE
MU (Multiple-Unit)Yes
Dynamic BrakesYes
Gear Ratio83:20
Tractive Effort (Starting)85,800 Lbs
Tractive Effort (Continuous)64,000 Lbs at 10.2 mph
Top Speed70 mph

C30-S7 (Super7-30C)

Entered Production5/1989 (General Electric #3000)
Years Produced5/1989 - 6/1993
GE ClassC30-S7 (Super7-30C)
Engine7FDL16 (16 cylinder)
Engine BuilderGeneral Electric
Horsepower3000
RPM1050
Length67' 3"
Height (Top Of Rail To Top Of Cab)15' 4 1/2"
Width9' 1"
Weight410,000 Lbs
Fuel Capacity3,000 Gallons
Air Compressor3CDC (Westinghouse)
Air Brake Schedule26L (Westinghouse)
TrucksC-C
Truck TypeFloating Bolster FB3 (GE)
Truck Wheelbase13' 7"
Wheel Size40"
Traction Motors752 (6), GE
Traction AlternatorGTA11AC, GE
Auxiliary GeneratorGY27, GE
MU (Multiple-Unit)Yes
Dynamic BrakesYes
Gear Ratio83:20
Tractive Effort/Starting105,000 Lbs
Tractive Effort/Continuous96,000 Lbs at 9.1 mph
Top Speed70 mph

Production Roster

B23-S7 (Super7-23B)

Owner Road Number Serial Number Order Number Completion Date Rebuild Location History
General Electric (GECX)20003840925253/1989GE: Erie, PAEx-Western Pacific U23B #2263
General Electric (GECX)20013839725253/1989Morrison-Knudsen: Boise, IDEx-Western Pacific U23B #2251
General Electric (GECX)20023840325253/1989Morrison-Knudsen: Boise, IDEx-Western Pacific U23B #2257
Monongahela Railway23003840025259/1989GE: Montreal, QCEx-Western Pacific U23B #2254
Monongahela Railway230138401252510/1989GE: Montreal, QCEx-Western Pacific U23B #2255
Monongahela Railway230238398252511/1989GE: Montreal, QCEx-Western Pacific U23B #2252
Monongahela Railway230338404252511/1989GE: Montreal, QCEx-Western Pacific U23B #2258
Monongahela Railway230438399252512/1989GE: Montreal, QCEx-Western Pacific U23B #2253
Monongahela Railway230538410252512/1989GE: Montreal, QCEx-Western Pacific U23B #2264
Monongahela Railway23063840325253/1989Morrison-Knudsen: Boise, IDEx-GE Demonstrator #2001
Monongahela Railway23073840825252/1990GE: Montreal, QCEx-Western Pacific U23B #2262
Monongahela Railway23083840625252/1990GE: Montreal, QCEx-Western Pacific U23B #2260
Monongahela Railway23093840725252/1990GE: Montreal, QCEx-Western Pacific U23B #2261
Monongahela Railway23103841125253/1990GE: Montreal, QCEx-Western Pacific U23B #2265
Roberval & Saguenay (Quebec)503752825166/1990GE: Montreal, QCEx-Santa Fe U23B #6337
Roberval & Saguenay (Quebec)5137529251612/1990GE: Montreal, QCEx-Santa Fe U23B #6338
Roberval & Saguenay (Quebec)524153125142/1991GE: Montreal, QCEx-Missouri Pacific U23B #2287

All Monongahela "Super 7s" rode on Blomberg trucks.  These units were all ex-Western Pacific U23B's, which the railroad had equipped with Blombergs from trade-in EMD units.

C30-S7 (Super7-30C)

Owner Road Number Serial Number Order Number Completion Date Rebuild Location History
General Electric (GECX)30003821318615/1989Morrison-Knudsen: Boise, IDEx-Southern U33C #3811
General Electric (GECX)30013821418615/1989Morrison-Knudsen: Boise, IDEx-Southern U33C #3812
General Electric (GECX)30024096118426/1989Morrison-Knudsen: Boise, IDEx-Union Pacific U30C #2956
General Electric (GECX)30033991818716/1990GE: Montreal, QCEx-Milwaukee Road U30C #5653
General Electric (GECX)30043992018716/1990GE: Montreal, QCEx-Milwaukee Road U30C #5655
General Electric (GECX)30053991718716/1990GE: Montreal, QCEx-Milwaukee Road U30C #5652
General Electric (GECX)30063991618716/1990GE: Montreal, QCEx-Milwaukee Road U30C #5651
General Electric (GECX)30073992218718/1990GE: Montreal, QCEx-Milwaukee Road U30C #5657
General Electric (GECX)30083991918718/1990GE: Montreal, QCEx-Milwaukee Road U30C #5654
General Electric (GECX)300938390187110/1990GE: Montreal, QCEx-Milwaukee Road U36C #8502
General Electric (GECX)301039921187110/1990GE: Montreal, QCEx-Milwaukee Road U30C #5656
Ferrocarriles Nacionales de México14000-1400139796, 39795183711/1989-12/1989Aguascalientes Shops, Mexico (NdeM)Ex-NdeM U36C #8986 and #8985
Ferrocarriles Nacionales de México14002-1400539372, 39779, 39363, 3977718371/1990-3/1990Aguascalientes Shops, Mexico (NdeM)Ex-NdeM U36C #8922, 8969, 8913, 8967
Ferrocarriles Nacionales de México14006-1400939376, 39794, 39774, 3977118375/1990-6/1990Aguascalientes Shops, Mexico (NdeM)Ex-NdeM U36C #8926, 8984, 8964, 8961
Ferrocarriles Nacionales de México14010-1401139353, 3935818375/1990San Luis Potosi Shops, Mexico (NdeM)Ex-NdeM U36C #8903 and #8908
Ferrocarriles Nacionales de México140163812518588/1990Aguascalientes Shops, Mexico (NdeM)Ex-NdeM U33Cu #8987, Nee-Southern Pacific U33C #8718
Ferrocarriles Nacionales de México14017-1401939782, 40246, 4024218379/1990Aguascalientes Shops, Mexico (NdeM)Ex-NdeM U36C #8972, 9306, 9302
Ferrocarriles Nacionales de México140203762118443/1990GE: Montreal, QCEx-Guilford U33C #659, nee-Delaware & Hudson #759
Ferrocarriles Nacionales de México140213762018443/1990GE: Montreal, QCEx-Guilford U33C #658, nee-Delaware & Hudson #758
Ferrocarriles Nacionales de México140223762118444/1990GE: Montreal, QCEx-Conrail U33C #6864, nee-Penn Central #6559
Ferrocarriles Nacionales de México14023-1402639377, 39373, 39798, 39802183711/1990Concarrel Shops, Mexico (NdeM)Ex-NdeM U36C #8927 and #8923; U36CG #8939 and #8943
Ferrocarriles Nacionales de México14027-1402839810, 3977618373/1991-4/1991Concarrel Shops, Mexico (NdeM)Ex-NdeM U36CG #8951 and U36C #8966
Ferrocarriles Nacionales de México1402943054183212/1990San Luis Potosi Shops, Mexico (NdeM)Ex-NdeM C30-7 #9601
Ferrocarriles Nacionales de México1403040250189212/1990San Luis Potosi Shops, Mexico (NdeM)Ex-NdeM U36C #9310
Ferrocarriles Nacionales de México1403143829187812/1990San Luis Potosi Shops, Mexico (NdeM)Ex-NdeM C30-7 #11038
Ferrocarriles Nacionales de México14032-1403343913, 4274918791/1991San Luis Potosi Shops, Mexico (NdeM)Ex-NdeM C30-7 #11059 and #6739
Ferrocarriles Nacionales de México140343935418372/1991San Luis Potosi Shops, Mexico (NdeM)Ex-NdeM U36C #8904
Ferrocarriles Nacionales de México140354305018372/1991Aguascalientes Shops, Mexico (NdeM)Ex-NdeM C30-7 #6797
Ferrocarriles Nacionales de México140364324018631/1991Aguascalientes Shops, Mexico (NdeM)Ex-NdeM C30-7 #9644
Ferrocarriles Nacionales de México140374264255781/1991Aguascalientes Shops, Mexico (NdeM)Ex-NdeM C36-7 #9333
Ferrocarriles Nacionales de México140384391918792/1991Aguascalientes Shops, Mexico (NdeM)Ex-NdeM C30-7 #11065
Ferrocarriles Nacionales de México140394320618633/1991Aguascalientes Shops, Mexico (NdeM)Ex-NdeM C30-7 #9611
Ferrocarriles Nacionales de México140404366618763/1991Aguascalientes Shops, Mexico (NdeM)Ex-NdeM C30-7 #11016
Ferrocarriles Nacionales de México140414320818634/1991Aguascalientes Shops, Mexico (NdeM)Ex-NdeM C30-7 #9613
Ferrocarriles Nacionales de México14042-1404439357, 39360, 3936118377/1991-8/1991San Luis Potosi Shops, Mexico (NdeM)Ex-NdeM U36C #8907, 8910, 8911
Ferrocarriles Nacionales de México14045-1405039364, 39805, 39770, 39359, 3978518376/1991-8/1991Aguascalientes Shops, Mexico (NdeM)Ex-NdeM U36C #8914 and #8915; U36CG #8946; U36C #8960, 8909, 8975
Ferrocarriles Nacionales de México14051-1405439384, 39807, 39801, 3979018371/1992-2/1992Aguascalientes Shops, Mexico (NdeM)Ex-NdeM U36C #8934; U36CG #8948 and #8942; U36C #8980
Ferrocarriles Nacionales de México14055-1405940320, 40319, 40325, 40323, 4032118941/1992-6/1992Empalme Shops, Mexico (NdeM)Ex-Ferrocarril del Pacífico U36C #413, 412, 418, 416, 414
Ferrocarriles Nacionales de México14060-1406439787, 39768, 39387, 39792, 3978818373/1992-5/1992Aguascalientes Shops, Mexico (NdeM)Ex-NdeM U36C #8977, 8958, 8937, 8982, 8978
Ferrocarriles Nacionales de México14065-1406637697, 3769618437/1992Empalme Shops, Mexico (NdeM)Ex-Ferrocarril del Pacífico U30C #407 and #406
Ferrocarriles Nacionales de México140673737118167/1992Empalme Shops, Mexico (NdeM)Ex-Ferrocarril del Pacífico U30C #403
Ferrocarriles Nacionales de México14068-1407539383, 39773, 39798, 39810, 39778, 39775, 39769, 3981518376/1992Aguascalientes Shops, Mexico (NdeM)Ex-NdeM U36C #8933, 8963; U36CG #8939 and #8951; U36C #8968, 8965, 8959; U36CG #8956
Ferrocarriles Nacionales de México1407643673182311/1992Aguascalientes Shops, Mexico (NdeM)Ex-NdeM C30-7 #11128
Ferrocarriles Nacionales de México14077-1407840249, 4024718921/1993-3/1993Aguascalientes Shops, Mexico (NdeM)Ex-NdeM U36C #9309 and #9307
Ferrocarriles Nacionales de México140794267818782/1993Aguascalientes Shops, Mexico (NdeM)Ex-NdeM C30-7 #6728
Ferrocarriles Nacionales de México14080-1408143823, 4418118231/1993-2/1993San Luis Potosi Shops, Mexico (NdeM)Ex-NdeM C30-7 #11032 and #11071
Ferrocarriles Nacionales de México140824367318772/1993San Luis Potosi Shops, Mexico (NdeM)Ex-NdeM C30-7 #11028
Ferrocarriles Nacionales de México140834382718783/1993San Luis Potosi Shops, Mexico (NdeM)Ex-NdeM C30-7 #11036
Ferrocarriles Nacionales de México1408437372181610/1992Empalme Shops, Mexico (NdeM)Ex-Ferrocarril del Pacífico U30C #404
Ferrocarriles Nacionales de México1408543618187311/1992Empalme Shops, Mexico (NdeM)Ex-Ferrocarril del Pacífico C30-7 #452
Ferrocarriles Nacionales de México14086-1408740316, 40324189412/1992Empalme Shops, Mexico (NdeM)Ex-Ferrocarril del Pacífico U36C #409 and #417
Ferrocarriles Nacionales de México140884361518735/1992Empalme Shops, Mexico (NdeM)Ex-Ferrocarril del Pacífico C30-7 #449
Ferrocarriles Nacionales de México140894423618264/1993San Luis Potosi Shops, Mexico (NdeM)Ex-NdeM C30-7 #11096
Ferrocarriles Nacionales de México140904507055784/1993San Luis Potosi Shops, Mexico (NdeM)Ex-NdeM C36-7 #9330
Ferrocarriles Nacionales de México140914382618784/1993San Luis Potosi Shops, Mexico (NdeM)Ex-NdeM C30-7 #11035
Ferrocarriles Nacionales de México140923977218374/1993Aguascalientes Shops, Mexico (NdeM)Ex-NdeM U36C #8962
Ferrocarriles Nacionales de México140934227418724/1993Aguascalientes Shops, Mexico (NdeM)Ex-NdeM C36-7 #9322
Ferrocarriles Nacionales de México14094-1409639811, 39797, 3981318375/1993-6/1993Aguascalientes Shops, Mexico (NdeM)Ex-NdeM U36CG #8952, 8938, 8954
Ferrocarriles Nacionales de México140974032218946/1993Empalme Shops, Mexico (NdeM)Ex-Ferrocarril del Pacífico U36C #415
Ferrocarriles Nacionales de México140984248018756/1993Empalme Shops, Mexico (NdeM)Ex-Ferrocarril del Pacífico C36-7 #426

Sources

  • Solomon, Brian. GE Locomotives: 110 Years Of General Electric Motive Power. St. Paul: MBI Publishing, 2003.
  • McDonnell, Greg. U-boats.  Toronto: Stoddart Publishing, 1994.

In addition, GE subcontracted work out to Morrison-Knudsen's plant in Boise, Idaho.  In fact, MK completed two of the three demonstrators General Electric had built.

The Monongahela acquired one of these demos while the other two were never sold.  From an outward appearance, Super 7's appeared almost nothing like their U-boat predecessors while internally they carried many of the same components.

They became a popular subject on the late-era Monongahela and were the final locomotives to adorn the railroad's classic grey livery with the large stylized "M" adorning the nose and carbody.

The units spent a few years in their original livery before being repainted into Conrail blue.  They were subsequently split up between Norfolk Southern and CSX after the Conrail takeover.  Today, they are scattered around the country at various short lines and private industries.

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    Steam locomotives of the Kansas City Southern built since 1900, with the Louisiana & Arkansas and the Texas company.

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  29. Kansas City Southern Diesel Roster (Built New)

    Oct 25, 26 11:46 AM

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    All-time diesel roster of the Kansas City Southern. E units, F units, Geeps, SD40s through SD70ACes, Fairbanks-Morse, Baldwin, Alco, and General Electric, with serials and order numbers.

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  30. Kansas City Southern Railway: Map, Photos, History

    Oct 25, 26 12:24 AM

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    The Kansas City Southern, from Arthur Stilwell's Gulf line to Canadian Pacific Kansas City on April 14, 2023. Steam and diesel rosters, the Southern Belle, and the Louisiana & Arkansas.

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  31. Indiana Harbor Belt Diesel Roster (All-Time)

    Oct 25, 26 12:17 AM

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    All-time diesel roster of the Indiana Harbor Belt. 202 locomotive frames, each counted once. NW2s, SW7s, SW1500s, road switchers, and gensets. Slugs and boosters are outside the count.

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  32. Indiana Harbor Belt Steam Roster (Built Since 1900)

    Oct 25, 26 12:13 AM

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    Steam locomotives of the Indiana Harbor Belt built since 1900. 182 engines, each counted once. 0-6-0s, 2-6-0s, 0-8-0s, and 2-8-2s. The three U-4a switchers are three-cylinder Brooks engines of 1927.

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  33. Indiana Harbor Belt Railroad: Map, Rosters, History

    Oct 25, 26 12:00 AM

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    Indiana Harbor Belt, the inner belt across the Calumet, from the East Chicago Belt of May 16, 1896. Renamed June 29, 1907. Still operating, headquarters Hammond. Steam roster is the companion, 182 loc…

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  34. NYC's "P Motor" Electric Locomotives

    Oct 24, 26 11:43 PM

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    New York Central P motors: 22 Alco-GE 2-C+C-2 electrics, Cleveland Union Terminal 1050–1071, class P-1a. 3,030 hp one-hour on 3,000-volt DC catenary, then 660-volt third rail as P-2a and P-2b.

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  35. Illinois Terminal Car Roster

    Oct 24, 26 11:40 PM

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    Illinois Terminal cars. Mainline motors, the 1948 streamliners, sleepers, Alton and Valley Division cars, express motors, and the line cars rebuilt from pull cars.

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  36. Illinois Terminal Diesel Roster

    Oct 24, 26 09:31 PM

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    All-time Illinois Terminal diesels, 62 frames. Alco S-2s and RS-1s, EMD switchers, GP7s, SD39s, GP38-2s, and the two GP20s. Serial numbers from the 1989 roster.

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  37. Illinois Terminal Electric Locomotives

    Oct 24, 26 08:22 PM

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    Illinois Terminal electric locomotives, 57 frames. Class A through Class D, the Decatur-built motors, and the battery locomotives. Class D is the same five Class C frames, rebuilt.

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  38. Illinois Terminal Steam Roster

    Oct 24, 26 07:37 PM

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    Illinois Terminal steam locomotives, 36 frames. Baldwin Moguls, three Class 30 Mikados, Florida East Coast 0-8-0s, and 2-6-0 No. 21, the last fire on June 30, 1950.

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  39. Illinois Terminal Railroad: Map, Roster, Photos, History

    Oct 24, 26 07:32 PM

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    Illinois Terminal, McKinley's Illinois Traction System, from the Danville coal towns to St. Louis. The McKinley Bridge, the sleeping cars, the 1937 break with the power company, the 1948 streamliners…

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  40. Southern Railway Diesel Roster (All-Time)

    Oct 23, 26 11:00 PM

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    All-time diesel roster of the Southern Railway. 2,505 locomotives in the system number series, from the 1939 demonstrator FT to GP50s and B30-7A1s. Serials included.

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  41. Illinois Central Diesel Roster (All-Time)

    Oct 23, 26 04:06 PM

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    Illinois Central and Illinois Central Gulf diesel locomotives, each frame once. The quantity column is 886. Serials and order numbers from Electro-Motive's builder lists. Paducah rebuilds and Gulf, Mo…

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  42. Illinois Central Gulf Diesel Roster

    Oct 23, 26 04:02 PM

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    Illinois Central Gulf operating numbers from August 10, 1972, to February 29, 1988. New frames stay on the Illinois Central diesel roster. Gulf, Mobile and Ohio frames stay on that roster. No Gulf fle…

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  43. Illinois Central Railroad: Map, Logo, History

    Oct 23, 26 03:50 PM

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    Illinois Central, the Main Line of Mid-America, from the 1850 land grant to Canadian National control on July 1, 1999. Charter lines, Cairo bridge, Paducah, and the Illinois Central Gulf. Steam quanti…

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  44. Grand Trunk Western Diesel Roster (All-Time)

    Oct 23, 26 12:53 PM

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    Grand Trunk Western diesel locomotives, each frame once. The quantity column is 377. Serials are filled for the Detroit, Toledo and Ironton and Detroit and Toledo Shore Line engines the railroad kept…

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  45. Grand Trunk Western Steam Roster

    Oct 23, 26 12:14 PM

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    Grand Trunk Western steam locomotives in service about 1937 to 1942, from Richard Leonard's class list. Drury has no chapter. The quantity column is the counted Grand Trunk Western rows. Two mixed Gra…

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  46. Grand Trunk Western Railroad: Map, Roster, History

    Oct 23, 26 12:09 PM

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    Grand Trunk Western, reporting mark GTW, Canadian National's railroad between Port Huron and Chicago. Trade name adopted in 1923. Steam class list quantity 232. Diesel quantity column 377. Identity in…

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  47. Green Bay and Western Railroad: Map, Rosters, History

    Oct 22, 26 11:18 PM

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    Green Bay & Western, the Green Bay Route, reporting mark GBW. From Kewaunee to Winona. Mailer's steam and diesel rosters, and the August 1993 sale to Fox Valley & Western.

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  48. Chicago & North Western Class E-4: Streamlined 4-6-4 Hudsons

    Oct 22, 26 10:28 PM

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    C&NW Class E-4, nine streamlined 4-6-4s, 4001–4009, Alco 1938. 84-inch drivers, 25-by-29 cylinders, 300 psi. Conventional Chicago–Omaha trains. Oil in 1947–48. Retired 1953–1956.

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  49. Gateway Western Railway: Map, Roster, History

    Oct 22, 26 02:43 PM

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    Gateway Western Railway, reporting mark GWWR. Class II from Kansas City to East St. Louis. Kansas City Southern control May 5, 1997. The 1992 diesel fleet, with serials and order numbers.

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