EMD FP7

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EMD FP7
Amtrak San Francisco Zephyr.jpg
AMTK #113 leading two EMD SDP40Fs with the San Francisco Zephyr at Yuba Gap, 1975.
Specifications
Power type Diesel-electric
Builder General Motors Electro-Motive Division (EMD)
General Motors Diesel (GMD, Canada)
Model FP7
Build date June 1949 – December 1953
Total produced 381
AAR wheel arr. B-B
Gauge 4 ft 8 12 in (1,435 mm)
Trucks Blomberg B
Wheel diameter 40 in (1,016 mm)
Minimum curve 23° (250 ft (76.20 m) radius)
Wheelbase 43 ft (13.11 m)
Length 55 ft 2 14 in (16.82 m)
Width 10 ft 8 in (3.25 m)
Height 15 ft (4.57 m)
Locomotive weight 260,000 lb (120,000 kg)
Fuel capacity 1,200 US gal (4,500 L)
Prime mover EMD 567B
Engine RPM range 800
Engine type Two-stroke diesel
Aspiration Roots-type supercharger
Generator EMD D-12
Traction motors (4) EMD D-27-B
Cylinders V16
Cylinder size 8 12 in × 10 in (216 mm × 254 mm)
Power output 1,500 horsepower (1,100 kW)
Career
Locale North America

The EMD FP7 was a 1,500 horsepower (1,100 kW), B-B dual-service passenger and freight-hauling diesel locomotive produced between June 1949 and December 1953 by General Motors' Electro-Motive Division and General Motors Diesel. Final assembly was at GM-EMD's La Grange, Illinois plant, excepting locomotives destined for Canada, in which case final assembly was at GMD's plant in London, Ontario. The FP7 was essentially EMD's F7A locomotive extended by four feet to give greater water capacity for the steam generator for heating passenger trains.

Design[edit]

While EMD's E-units were successful passenger engines, their A1A-A1A wheel arrangement made them less useful in mountainous terrain.[citation needed] Several railroads had tried EMD's F3 in passenger service, but there was insufficient water capacity in an A-unit fitted with dynamic brakes. The Atchison, Topeka and Santa Fe Railway's solution was to replace the steam generators in A-units with a water tank, and so only fitted steam generators into the B-units. The Northern Pacific Railway's solution was to fit extra water tanks into the first baggage car, and to pipe the water to the engines. The real breakthrough came when EMD recognized the problem and added the stretched FP7 to its catalog.

A total of 381 cab-equipped lead A units were built; unlike the freight series, no cabless booster B units were sold. Regular F7B units were sometimes used with FP7 A units, since they, lacking cabs, had more room for water and steam generators. The FP7 and its successor, the FP9, were offshoots of GM-EMD's highly successful F-unit series of cab unit freight diesels.

F3s, F7s, and F9s equipped for passenger service are not FP-series locomotives, which although similar in appearance have distinctive differences, including but not limited to the greater body length. The extra 4 ft (1.2 m) of length was added behind the first body-side porthole, and can be recognised by the greater distance between that porthole and the first small carbody filter grille. The corresponding space beneath the body, behind the front truck, was also opened up; this either remained an empty space or was filled with a distinctive water tank shaped like a barrel mounted transversely.[1]

Original buyers[edit]

Locomotives built by EMD at La Grange, Illinois[edit]

Railroad Quantity FP7 Quantity F7B (where bought with FP7) Road numbers FP7 Road numbers F7B Notes
Electro-Motive Division (demonstrator)
1
2
7001
7002–7003
to Soo Line (Wisconsin Central) 2500A, 2500B, 2501B
Electro-Motive Division (demonstrator)
1
2
9051
9052–9053
to Soo Line 500A, 500B, 501B
Atlanta and West Point Rail Road
4
551–554
Atlantic Coast Line
44
850–893
Alaska Railroad
3
1
1510–1514 (even)
1507
Chicago and Eastern Illinois Railroad
11
1600–1609, 1609 2nd
1609 1st wrecked 6/28/1951 and replaced with new unit with same road number and serial number
Chesapeake and Ohio Railway
16
7
8000–8015
8500–8506
Chicago Great Western Railway
3
116A,C, 116C 2nd
116C 1st wrecked 6/2/1951 and replaced with new unit with same road number and serial number
Chicago, Rock Island and Pacific Railroad
10
402–411
Commuter service
Clinchfield Railroad
1
200
Ferrocarriles Nacionales de México
17
7
6300–6309, 6328A–6334A
6328B–6334B
Ferrocarril Sonora-Baja California
2
23035–23036
Florida East Coast Railway
5
571–575
Georgia Railroad
3
1002–1004
Louisville and Nashville Railroad
45
600–634, 663–672
Milwaukee Road
32
16
90A,C–105A,C
90B–105B
90–94 renumbered 60–64 for freight service
Missouri-Kansas-Texas Railroad
8
4
121A,C–124A,C
121B–124B
Northern Pacific Railway
2
6600–6601
Pennsylvania Railroad
40
14
9832A–9871A
9832B–9858B (even)
A units renumbered 4332-4371 and B units 4150-4163 by PRR for Penn Central; 18 scattered A units 4332-4370 to Conrail
Reading Company
8
900–907
900, 902, 903 to SEPTA, renumbered 4371-4373
Richmond, Fredericksburg and Potomac Railroad
3
1201–1203
Arabian American Oil Company (Saudi Arabia)
2
1006–1007
St. Louis-San Francisco Railway
12
5040–5051
Soo Line
5
2
501A–503A, 504–505
502B–503B
Soo Line (Wisconsin Central Railway)
1
2501A
Southern Railway (Cincinnati, New Orleans and Texas Pacific Railway)
20
6130–6149
Southern Pacific Company
16
6446–6461
St. Louis Southwestern Railway (“Cotton Belt”)
1
330
Renumbered to 306 then leased to Southern Pacific as SP 6462
Union Pacific Railroad
2
2
911-912
910B, 910C
Renumbered to 1498 - 1499
Western Railway of Alabama
2
502–503
Western Pacific Railroad
4
2
804A,C–805A,C
804B–805B
Totals 324 59

Locomotives built by GMD at London, Ontario[edit]

Railroad Quantity FP7 Quantity F7B
(were bought with FP7)
Road numbers FP7 Road numbers F7B Notes
Canadian Pacific Railway
35
29
4028–4041, 4058–4063, 4066–4075, 4099–4103
4424–4448, 4459–4462
Ontario Northland Railway
22
1500–1521
Totals 57 29

Preserved examples[edit]

See also[edit]

References[edit]

Notes[edit]

Bibliography[edit]

  • Dorin, Patrick C. (1972). Chicago and North Western Power. Superior Publishing. pp. 123–127. ISBN 0-87564-715-4. 
  • Lamb, J. Parker (2007). Evolution of the American Diesel Locomotive. Railroads Past and Present. Bloomington, IN, USA: Indiana University Press. ISBN 9780253348630. 
  • Marre, Louis A. (1995). Diesel Locomotives: The First 50 Years: A Guide to Diesels Built Before 1972. Railroad Reference Series (Book 10). Waukesha, WI, USA: Kalmbach Publishing. ISBN 0890242585. 
  • Pinkepank, Jerry A. (1973). The Second Diesel Spotter’s Guide. Milwaukee, WI: Kalmbach Publishing Company. ISBN 0-89024-026-4. 
  • Schafer, Mike (1998). Vintage Diesel Locomotives. Enthusiast Color Series. Osceola, WI, USA: MBI Publishing. ISBN 0760305072. 
  • Solomon, Brian (2000). The American Diesel Locomotive. Osceola, WI, USA: MBI Publishing. ISBN 0760306664. 
  • Solomon, Brian (2005). EMD F-Unit Locomotives. North Branch, MN, USA: Specialty Press. ISBN 1580071929. 
  • Solomon, Brian (2006). EMD Locomotives. St. Paul, MN, USA: Voyageur Press. ISBN 9780760323960. 
  • Solomon, Brian (2010). Vintage Diesel Power. Minneapolis, MN, USA: MBI Publishing. ISBN 9780760337950. 
  • Solomon, Brian (2011). Electro-Motive E-Units and F-Units: The Illustrated History of North America's Favorite Locomotives. Minneapolis, MN, USA: Voyageur Press. ISBN 9780760340073. 
  • Solomon, Brian (2012). North American Locomotives: A Railroad-by-Railroad Photohistory. Minneapolis, MN, USA: Voyageur Press. ISBN 9780760343708. 
  • Wilson, Jeff (1999). F Units: The Diesels That Did It. Golden Years of Railroading series. Waukesha, WI, USA: Kalmbach Publishing. ISBN 0890243743. 

External links[edit]