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Delaware, Lackawanna & Western class Q-1
United States | 1927 | 5 produced
No. 1504 in Scranton, Pennsylvania
No. 1504 in Scranton, Pennsylvania
collection Taylor Rush

The Lackawanna was one of the first US railroads to adopt the 4-8-4 wheel arrangement. In contrast to the Northern Pacific, these were not called “Northern” here, but “Poconos”. They were seen here as the successor to the 4-8-2 with a larger firebox. Thanks to thermic siphons and arch tubes, they came up with a firebox heating surface of 493 square feet. With a driver diameter of 77 inches, they were clearly intended for express trains, while a diameter of only 73 inches was chosen at the Northern Pacific. The later Poconos of the Lackawanna also had smaller wheels.

General
Built1927
ManufacturerALCO
Axle config4-8-4 (Northern) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Wheelbase46 ft 8 in
Fixed wheelbase20 ft
Total wheelbase82 ft 2 1/2 in
Adhesive weight421,000 lbs
Total weight269,000 lbs
Axle load67,250 lbs
Water capacity12,000 us gal
Fuel capacity32,000 lbs (coal)
Power
Power sourcesteam
Estimated power4,500 hp (3,356 kW)
Optimal speed45 mph
Starting effort64,379 lbf
Power Plant
Driver diameter77 in
Boiler pressure250 psi
Expansion typesimple
Cylinderstwo, 27 x 32 in
Boiler
Grate area88.2 sq ft
Firebox area493 sq ft
Tube heating area4,700 sq ft
Evaporative heating area5,193 sq ft
Superheater area1,324 sq ft
Total heating area6,517 sq ft
Calculated Values
steam locomotive
express
last changed: 05/2023
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