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Boston & Albany class D-1a
United States | 1928 | 5 produced
No. 1297 in August 1951 in Syracuse, New York
No. 1297 in August 1951 in Syracuse, New York
Bert Pennypacker / collection Taylor Rush

These heavy tank locomotives were developed for local service in the Boston area. Due to the tank locomotive design rarely used in the USA, they could run in both directions at high speed. A three-axle rear bogie was used to carry sufficiently large supplies. This led to the 4-6-6T wheel arrangement, which had previously only been used on smaller Mason Bogie locomotives.

In normal operation they often pulled ten steel cars and were apparently able to move up to 20 of these cars with sufficient acceleration. They were regarded as successful all-purpose locomotives, but were only used in the Boston area due to the small number of units. They bore the markings of New York Central for most of their lives. When they were replaced by diesel locomotives in their traditional area of application around 1950, no new purpose was found, so they were probably scrapped in a timely manner.

General
Built1928
ManufacturerALCO
Axle config4-6-6T 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Length loco56 ft 9 in
Wheelbase42 ft 8 in
Fixed wheelbase15 ft
Service weight352,000 lbs
Adhesive weight180,000 lbs
Axle load60,000 lbs
Water capacity5,000 us gal
Fuel capacity12,000 lbs (coal)
Power
Power sourcesteam
Estimated power2,400 hp (1,790 kW)
Optimal speed37 mph
Starting effort41,651 lbf
Power Plant
Driver diameter63 in
Boiler pressure215 psi
Expansion typesimple
Cylinderstwo, 23 1/2 x 26 in
Boiler
Grate area60.8 sq ft
Firebox area213 sq ft
Tube heating area2,548 sq ft
Evaporative heating area2,761 sq ft
Superheater area788 sq ft
Total heating area3,549 sq ft
Calculated Values
steam locomotive
passenger
tank locomotive
last changed: 03/2023
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