- USRA standard
The USRA standard
locomotive s andrailroad car s were designed by theUnited States Railroad Administration , thenationalised rail system of theUnited States duringWorld War I . 1,856steam locomotive s and over 100,000 railroad cars were built to these designs during the USRA's tenure. The locomotive designs in particular were the nearest the Americanrailroad s and locomotive builders ever got to standard locomotive types, and after the USRA was dissolved in 1920 many of the designs were duplicated in number, 3,251 copies being constructed overall. The last steam locomotive built for aClass I railroad in the United States, an0-8-0 built by theNorfolk and Western Railway , was a USRA design. A total of 97 railroads used USRA or USRA-derived locomotives.Steam locomotive types
The USRA developed designs for
0-6-0 and0-8-0 switcher s,2-6-6-2 and2-8-8-2 Mallet locomotive s, and both light and heavy versions of the2-8-2 ,2-10-2 ,4-6-2 , and4-8-2 types. The light versions were designed with anaxle load of 54,000 lb (24,500 kg) permitting usage on the vast majority of railroads, while the heavy versions were designed to a maximum axle load of 60,000 lb (27,200 kg) for lines with more heavily constructed track.USRA 0-6-0
255 of the
USRA 0-6-0 design were built, as well as a great many copies.USRA 0-8-0
175 of the
USRA 0-8-0 design were built, and it was copied extensively thereafter.USRA Light 2-8-2 "Mikado"
625 of the
USRA Light Mikado type were constructed, making it the most populous USRA type.USRA Heavy 2-8-2 "Mikado"
233 of the
USRA Heavy Mikado s were built.USRA Light 2-10-2 "Santa Fe"
94
USRA Light Santa Fe locomotives were constructed.USRA Heavy 2-10-2 "Santa Fe"
175
USRA Heavy Santa Fe locomotives were built.USRA Light 4-6-2 "Pacific"
81
USRA Light Pacific s were constructed.USRA Heavy 4-6-2 "Pacific"
20
USRA Heavy Pacific s were built.USRA Light 4-8-2 "Mountain"
47 of the
USRA Light Mountain type were built.USRA Heavy 4-8-2 "Mountain"
15
USRA Heavy Mountain s were constructed.2-6-6-2
30 of the
USRA 2-6-6-2 type were built.2-8-8-2
106 of the
USRA 2-8-8-2 locomotives were constructed. TheNorfolk and Western Railway , in particular, continued building this type after the USRA period, developing and modernising it over time, as its Class Y. A N&W Y6B was the last conventional freight-hauling steam locomotive built in the United States.Freight cars
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