Alco S-5 (DL421A)

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Data Sheet Information Compiled by: JEAN-DENIS BACHAND
New: 2 April 2005 Drawing by: Jacques Belanger
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Engine Builder: Alco Engine: 4-cycle Model 251A 6L
Bore & Stroke 9" X 10.5"
RPM (Maximum / Minimum) 1000 / 370
Main Generator: GE - GT553 Horsepower: 800
Gear Ratio: 74:18 Speed: 60 mph
4-Wheel Configuration: B-B
Traction Motor Blowers: Mechanical Driven (2) Model: ?
Weight: 230,000 lbs Traction Motors: GE 731 (six)
Tractive Effort (starting) 57,500 lbs @ 30% Tractive Effort (continuous): 46,000 lbs @ 5 mph
Multiple Unit Capability: No Dynamic Braking: Yes
Auxilary Generator: GE GMC139 Alternator: --
Air Brake: Westinghouse Model: 26L
Compressor: Westinghouse Model: 3CD
Boiler Type: -- Lbs/hr: --
Quantity Built: 7 Dates: 4 & 5/1954
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Exterior Dimensions S-5
Total Length 45'-05"
Pilot to Pilot 36'-06"
Wheel Diameter 40"
Truck Wheel Base 8'-00"
Height to Top Engine Hood 12'-03"
Height to Top Cab Hood 14'-08"
Cab Width 10'-00"
Top Walkway Width 8'-04"
Walkway Width 5'-00"
Engine Hood Width 9'-11"
Center Bolster 22'-00"
Center Front Truck to Front Pilot 7'-06"
Center Rear Tucrk to Rear Pilot 7'-06"
Distance between Truck Centers 30'-00"
Minimum Turning Radious 50 degrees
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Fuel Oil: 635 Lubricating Oil: 140
Engine Cooling Water: 110 Sand Capacity: 26 cu. ft.
Options: Dynamic Brakes
  • Air Signal Lines
  • Hump Control
  • Stanley Heater
Reference Sources:
  • Alco Design Data
  • Alco Reference #1 by Bob Liljestrand
  • Brotherhood of Locomotive Firemen and Enginemen Magazine, October 1953

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