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Pennsylvania class L
later class D16
United States | 1895 | 429 produced
D16sb No. 6217 in January 1916 at Olean, New York
D16sb No. 6217 in January 1916 at Olean, New York
Harold K. Vollrath

The last 4-4-0 locomotives the PRR procured was the class L, which was soon renamed D16. It was derived from the class P or D14, but had a higher mounted boiler with a larger Belpaire firebox. The D16 with 68-inch wheels and the D16a with 80-inch wheels were developed for different types of lines. Together with the D16c and D16d, which also had the large wheels, 429 units were built by 1910.

Since they were increasingly replaced by larger locomotives shortly after the turn of the century and were used on branch lines, many of the locomotives with large wheels were subsequently given ones with a diameter of 68 inches. From 1914 a total of 241 D16b received a superheater and became the D16sb. Some D16d also became D16sd. Many of the locomotives survived into the 1930s, some into the 1940s and a few were the last to be retired in 1953. Today only the D16sb No. 1223 still exists not operational in the Railroad Museum of Pennsylvania.

VariantD16D16bD16c, D16dD16sb
General
Built1895-19101914
ManufacturerAltoona
Axle config4-4-0 (American) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Length62 ft 5 3/16 in
Wheelbase22 ft 9 1/2 in
Fixed wheelbase7 ft 9 in
Total wheelbase50 ft 3 1/2 in50 ft 3 1/2 in55 ft 0 1/4 in
Service weight135,900 lbs138,000 lbs138,700 lbs142,100 lbs
Adhesive weight93,600 lbs97,100 lbs94,900 lbs98,150 lbs
Total weight217,900 lbs270,000 lbs218,700 lbs281,000 lbs
Axle load48,300 lbs50,400 lbs48,100 lbs52,000 lbs
Water capacity3,600 us gal5,500 us gal3,000 us gal5,600 us gal
Fuel capacity15,000 lbs (coal)25,000 lbs (coal)15,000 lbs (coal)26,000 lbs (coal)
Power
Power sourcesteam
Estimated power900 hp (671 kW)1,250 hp (932 kW)
Optimal speed40 mph28 mph33 mph
Starting effort14,445 lbf20,578 lbf17,491 lbf23,902 lbf
Power Plant
Driver diameter68 in80 in68 in
Boiler pressure185 psi175 psi
Expansion typesimple
Cylinderstwo, 15 1/2 x 26 intwo, 18 1/2 x 26 intwo, 20 1/2 x 26 in
Boiler
Grate area33 sq ft33.2 sq ft
Firebox area171.4 sq ft166.7 sq ft166.2 sq ft181 sq ft
Tube heating area1,746.6 sq ft1,733.3 sq ft1,733.8 sq ft1,219 sq ft
Evaporative heating area1,918 sq ft1,900 sq ft1,400 sq ft
Superheater area253 sq ft
Total heating area1,918 sq ft1,900 sq ft1,653 sq ft
Calculated Values
steam locomotive
express
passenger
last changed: 03/2024
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