The reference for locomotives and railcars


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Erie class K-5a and b
United States | 1923 | 11 produced
No. 2936
No. 2936
H. W. Pontin / collection Taylor Rush

Based on the USRA Heavy Pacifics, which the Erie was the only one to receive, it received ten more locomotives in 1923. These were similar in size to the USRA engines, but had a larger superheater and were slightly heavier. The original 10,000 gallon water and 16 short tons of coal tenders were soon replaced with larger 16,500 gallon, 24 short tons tenders. In 1926, a single K-5b was ordered to test uniflow cylinders. Since these did not lead to the desired results, they were replaced with conventional cylinders.

VariantK-5a (large tender)K-5b
Axle config4-6-2 (Pacific) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Wheelbase37 ft 1 in
Fixed wheelbase14 ft
Total wheelbase80 ft 3 3/4 in
Service weight323,000 lbs
Adhesive weight205,300 lbs
Total weight637,200 lbs529,000 lbs
Axle load68,900 lbs
Water capacity16,500 us gal12,000 us gal
Fuel capacity48,000 lbs (coal)32,000 lbs (coal)
Power sourcesteam
Estimated power3,450 hp (2,573 kW)3,250 hp (2,424 kW)
Optimal speed48 mph44 mph
Starting effort46,121 lbf47,238 lbf
Power Plant
Driver diameter79 in
Boiler pressure210 psi200 psi
Expansion typesimple
Cylinderstwo, 27 x 28 intwo, 28 x 28 in
Grate area70.8 sq ft70.3 sq ft
Firebox area381 sq ft388 sq ft
Tube heating area3,346 sq ft3,343 sq ft
Evaporative heating area3,727 sq ft3,731 sq ft
Superheater area1,070 sq ft
Total heating area4,797 sq ft4,801 sq ft
Calculated Values
steam locomotive
last changed: 04/2023

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