Alco S-2 (E1540) and S-4 (1540A & 1540B)

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Data Sheet Information Compiled by: JEAN-DENIS BACHAND
Revised: 12 Oct. 2017 Drawing by: Jean-Denis Bachand
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Engine Builder: Alco Engine: 4-cycle Model 539 6L
Bore & Stroke 12.5" X 13.0"
RPM (Maximum / Minimum) 740 / 315 (S-2) and 740/275 (S-4)
Main Generator: GE - GT553 (S-2) / GT 563 (S-4) Horsepower: 1000
Gear Ratio: 75:16 Speed: 60 mph
Trucks: 4-Wheel Configuration: B-B
Traction Motor Blowers: Mechanical Driven (2) Model: ?
Weight: 229,700 lbs Traction Motors: S-2: GE 731 (Four) / S-4: GE 731D
Tractive Effort (starting) 69,000 @ 30% (S-2) and 72,400 lbs @ 30% (S-3) Tractive Effort (continuous): 29,200 lbs @ 6 mph / 34,000 @ 8 mph
Multiple Unit Capability: Yes Dynamic Braking: Yes
Auxilary Generator: GE SMG139 Alternator: --
Air Brake: Westinghouse Model: 14EL
Compressor: Westinghouse Model: 3CD
Quantity Built: 1,462 (S-2) / 651 (S-4) Dates: S-2: 6/1950 to 11/1953 and S-4: 6/1950 to 1/1961
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Drawing by: JEAN-DENIS BACHAND
Exterior Dimensions S-2 and S-4
Total Length 44'-05"
Pilot to Pilot 37'-00"
Wheel Diameter 40"
Truck Wheel Base 8'-00"
Height to Top Engine Hood 12'-01"
Height to Top Cab Hood 14'-05"
Cab Width 10'-00"
Walkway Width 4'-01"
Engine Hood Width 6'-10"
Center Bolster 22'-00"
Center Front Truck to Front Pilot 7'-06"
Center Rear Tucrk to Rear Pilot 7'-00"
Distance between Truck Centers 30'-00"
Minimum Turning Radious 50 degrees
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Fuel Oil: 635 Lubricating Oil: 80
Engine Cooling Water: 200 Sand Capacity: 27 cu. ft.
Options: Dynamic Brakes
  • Air Signal Lines
  • Hump Control
  • Stanley Heater
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Drawing by: JEAN-DENIS BACHAND
Reference Sources:
  • Alco Design Data
  • Canadian Pacific Mechanical Data
  • Erie Lackawana Mechanical Data

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