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Alco DL-202 No. 1500c, the "Black Maria".

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Alco DL-202 No. 1500c, the Black Maria.

Alco DL-202 & DL-203 "Black Maria" Diesel Locomotives
The ALCO DL-202-2 and DL-203-2 diesel-electric locomotive (known informally as the Black Maria) was an experimental freight locomotive produced by ALCO of Schenectady, New York. The primary diesel builders Alco, Baldwin and EMD pushed the War Production Board (WPB) for more opportunities to build more diesels. The Transportation Equipment Division of the WPB announced a production schedule on December 10, 1943 that allowed Alco to build one 4,500 horsepower experimental diesel locomotive. This experimental diesel locomotive was to be built in the fourth quarter of 1944. The two A units were built in January 1945 and the B unit at a later date in 1945. The two A units were put on test at Building No. 37 at Schenectady to work out problems with the connecting rods and turbocharger in the Alco 241 engine. The total production run included 2 cab DL202-2 A units, and a single DL203-2 B cabless booster) unit. The locomotives were powered by a V12 ALCO 241 diesel engine, rated at 1,500 hp. The units were released for test in September 1945. The locomotive could attain a top speed of 50 mph (Freight) and 78 mph (Passenger). With the B-B wheel arrangement and carbody construction, equipment layout and electrical gear these experimental units were the immediate predecessors of the FA units to come in early 1946. Outwardly, the bodies strongly resembled those on the DL-109, some of which were still under construction at Schenectady in early 1945.

The three units were numbered 1500A, B, C and were tested on the New York Central Railroad, the Delaware and Hudson Railroad, the New York, New Haven and Hartford Railroad, and the Bangor and Aroostook Railroad, among others. As no orders materialized for such units, and no railroad bought the demonstrators, they were scrapped in September 1947.

Alco DL-202 and DL-203 Overview
Type and origin
Power type: Diesel-electric
Builder: American Locomotive Company
Serial numbers: 71257–71258 (A units), 69974 (B unit)
Model: DL202-2 (A units) and DL203-2 (B unit)
Total produced: 2 A units, 1 B unit

AAR wheel arrangement: B-B
UIC class: Bo′Bo′
Prime mover: ALCO 241
Engine type: Four-stroke diesel
Cylinders: V12
Performance figures
Main Generator: GT564A (by GE)
Horsepower: 1,500
Gear Ratio: Freight - 71:21, 64:19, 61:22; passenger - 58:25 Speed: 80 mph (freight); 125 mph (passenger)
Weight: 230,000 lbs
Traction Motors: GE 726 (four)
Traction Motor Blowers: General Electric Type: GE Belt Driven (Two)
Tractive Effort: (starting) 57,500 lbs
Multiple Unit Capability: Yes
Dynamic Braking: Yes
Auxilary Generator: GE GY20A
Alternator: GE GTAPAI 6
Air Brake: Westinghouse Model: 24RL
Compressor: Westinghouse Model: 2CD
Exterior Dimensions
Cab Unit / Booster Unit
Total Length: 51"-06" / 50'-02"
Pilot to Pilot: 50'-06" /
Wheel Diameter: 40" / 40"
Truck Wheel Base: 9'-04" / 9'-04"
Height to Top Engine Hood: 14'-02.5" /
Height to Top Cab Hood: 14'-00" / Not Applicable
Cab Width: 10'-00" / Not Applicable
Engine Hood Width: 10'-00"
Center Bolster: 27'-02" / 27'-02"
Center Front Truck to Front Pilot: 12'-10" / 11'-06"
Center Rear Truck to Rear Pilot: 11'-06" / 11'-06"
Distance between Truck Centers: 36'-06" /
Minimum Turning Radious: 21 degrees
Fuel Oil: 800 gal.
Lubricating Oil: 167 gal.
Engine Cooling Water: 200 gal.
Sand Capacity: 22 cu. ft.
Equipment & Options:
Manual Transition
Turbo Charger 7RD-2 (GE)
Automatic Train Control
Thru Steam Trainline
Operators: American Locomotive Company
Numbers: 1500 A, 1500 B, 1500 C
Disposition: All scrapped, September 1947

See also:

Alco Diesel-Electric Locomotives

Diesel-Electric Locomotives

American Locomotive Company

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