EMD F7A and F7B

Drawing of ACL F7A #393 in a purple and silver scheme
Data Sheet Information Compiled by: JEAN-DENIS BACHAND
Revised: 18 September 2012 / New: 4 July 2006  Artwork by: Jean-Denis Bachand
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Engine Builder: General Motors Engine: 567B 16 cylinder
Bore & Stroke 8" X 10"
RPM (Maximum / Minimum) 800 / 275
Main Generator: GM - D12B Horsepower: 1500
Gear Ratio: 62:15 Speed: 65 mph
Trucks: 4-Wheel Configuration: B-B
Traction Motor Blowers: Electrical Drive (4) Model: GM
Weight: 230,000 lbs (and 228,000 for F7B) Traction Motors: GM - D27C (four)
Tractive Effort (starting) 56,500 lbs @25% Tractive Effort (continuous): 40,000 lbs @ 9.3 mph
Multiple Unit Capability: Yes Dynamic Braking: Yes
Auxilary Generator: Delco A8102 Alternator: D14
Air Brake: Westinghouse Model: 24RL
Compressor: Gardner Denver Model: WBO
Quantity Built: 2366 (and 1483 for F7B unit) Dates: 2/1949 to 12/1953
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Exterior Dimensions F7A (and F7B)
Total Length 50'-08" (and 50'-00" for F7B)
Wheel Diameter 40"
Truck Wheel Base 9'-00"
Total Wheel Base 39'-00"
Height to Top Engine Hood 14'-01.5"
Height to Top Cab 15'-00" (N/A for F7B)
Cab Width 10'-07" (N/A for F7B)
Engine Hood Width 9'-10"
Center Front Truck to Front Pilot 9'-11" (and 5'-06" for F7B both ends)
Center Rear Truck to Rear Pilot 8'-06"
Distance between Truck Centers 39'-00"
Minimum Turning Radious 30 degrees
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Fuel Oil: 1200 Lubricating Oil: 200
Engine Cooling Water: 230 (and 215 for F7B) Sand Capacity: 16 cu. ft.
Options: Vapor Clarkson Boiler (Model OK4625): 1200 lbs/hr (and Model OK4616: 1200/lbs/hr for F7B)
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Drawing of Rock Island F7B in red and white livery.
- Artwork by: Jean-Denis Bachand
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Reference Sources:

  • Diesel Locomtoives, Vol.2, by Bob Hayden
  • Illustrated Treasury of GM Locomotives, by James W. Kerr
  • Diesel Locomotives, The First 50 Years by Louis A. Marre
  • The Second Diesel Spotter's Guide, by Jerry A. Pinkepank
  • "Early Diesel and Electric Locomotives," Rail Heritage Publications
  • Diesel & Electric Locomotive Specificiations, 1981 by F.K. Hudson
  • Train Shed Cyclopedia, Vol. 20, 58, 60, 64, 80

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