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Nashville, Chattanooga & St. Louis class H7
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United States | 1903
36 produced
H7A-37 No. 408 in August 1940 at Memphis, Tennessee
H7A-37 No. 408 in August 1940 at Memphis, Tennessee
Arthur B. Johnson collection

The H7 was a class of 36 Consoliddations built by Baldwin for the NC&StL between 1903 and 1907. Compared to the H6 introduced in 1902, they had a larger tube surface, but were identical in other dimensions. This included drivers of 56 inches, 21 by 28 inch cylinders, a grate of 46,6 square feet and a boiler pressure of 195 psi. The first batch of ten was designated H7-37 due to their starting tractive effort of roughly 37,000 pounds, identical to the H6-37.

Next were 16 H7A-37 and ten H7B-37 which had fewer tubes. While the original H7 and the H7A had Stephenson valve gear, the H7B was built with Walschaerts valve gear. Starting in 1918, the railroad's own workshops started to superheat the class. They now had a boiler pressure of only 180 psi, but the cylinder diameter had been increased to 23 inches. As this resulted in a higher starting tractive effort, they were designated H7C-40. The class was retired between 1946 and 1951.

VariantH7-37H7B-37rebuilt H7C-40
General
Built19031907from 1918
ManufacturerBaldwinNashville
Wheel arr.2-8-0 (Consolidation) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Length63 ft 7 7/8 in61 ft 5 in
Wheelbase23 ft 8 in
Rigid wheelbase15 ft 4 in
Total wheelbase52 ft 6 1/2 in
Empty weight150,440 lbs156,280 lbs
Service weight166,300 lbs170,300 lbs
Adhesive weight150,300 lbs153,300 lbs
Total weight275,300 lbs279,300 lbs
Water capacity5,000 us gal5,500 us gal
Fuel capacity21,000 lbs (coal)
Boiler
Grate area46.6 sq ft
Firebox area171.4 sq ft172.1 sq ft191 sq ft
Tube heating area2,275.9 sq ft1,981.6 sq ft1,696 sq ft
Evaporative heating area2,447.3 sq ft2,153.8 sq ft1,887 sq ft
Superheater area405 sq ft
Total heating area2,447.3 sq ft2,153.8 sq ft2,292 sq ft
VariantH7-37H7B-37rebuilt H7C-40
Power Plant
Driver diameter56 in
Boiler pressure195 psi180 psi
Expansion typesimple
Cylinderstwo, 21 x 28 intwo, 23 x 28 in
Power
Power sourcesteam
Estimated power1,200 hp (895 kW)1,300 hp (969 kW)
Starting effort36,548 lbf40,468 lbf
Calculated Values
steam locomotive
freight
last changed: 06/2026
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