The reference for locomotives and railcars


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New York Central class K-5
United States | 1926 | 35 produced
Streamlined K-5s No. 4917 in November 1941 at Indianapolis, Indiana
Streamlined K-5s No. 4917 in November 1941 at Indianapolis, Indiana
Howard W. Ameling / collection Taylor Rush

The K-5 class designated the heaviest Pacifics of the New York Central System. Built primarily for the subsidiaries, they were divided into the K-5 and K-5a subclasses. Numbers 4915 and 4917 were fitted with streamlining in 1936 designed by Henry Dreyfuss and called the “upside down bathtub”. These two pulled important express trains like the “Mercury” and became subclass K-5b.

VariantK-5, K-5aK-5b
Axle config4-6-2 (Pacific) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Wheelbase36 ft 11 in
Fixed wheelbase13 ft 8 in
Total wheelbase79 ft 5 1/2 in
Service weight297,500 lbs317,000 lbs
Adhesive weight184,500 lbs193,800 lbs
Total weight572,000 lbs609,300 lbs
Axle load61,500 lbs64,600 lbs
Water capacity15,000 us gal
Fuel capacity32,000 lbs (coal)
Power sourcesteam
Estimated power3,300 hp (2,461 kW)3,375 hp (2,517 kW)
Optimal speed55 mph54 mph
Starting effort38,600 lbf39,541 lbf
Power Plant
Driver diameter79 in
Boiler pressure205 psi210 psi
Expansion typesimple
Cylinderstwo, 25 x 28 in
Grate area67.8 sq ft
Firebox area257 sq ft
Tube heating area3,695 sq ft
Evaporative heating area3,952 sq ft
Superheater area1,158 sq ft
Total heating area5,110 sq ft
Calculated Values
steam locomotive
last changed: 07/2023

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