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The M1 was a class of steam locomotive of the Pennsylvania Railroad (PRR). It was a class of heavy mixed-traffic locomotives of the 4-8-2 "Mountain" arrangement, which uses four pairs of driving wheels with a four-wheel guiding truck in front for stability at speed and a two-wheel trailing truck to support the large firebox needed for sustained power.
Many 4-8-2 locomotives were therefore built for dual service. [citation needed] About 2,200 Mountain type locomotives were built for 41 American railroads. With 600 4-8-2 locomotives, the largest user in the United States was the New York Central Railroad (NYC). The Water Level Route eschewed the hilly moniker in favor of Mohawk type. [32]
The New York Central became the largest 4-8-2 user in North America, with 600 locomotives of this type built for its service; only the Pennsylvania Railroad came close, with 301 M1's of the type. The Mohawk type was the pre-eminent freight power of the network, displacing the 2-8-2 type from first-line service.
The 6755 was a class M1a and was used predominantly in freight service, though it would occasionally be used for passenger trains. In 1953, the locomotive went back to the Altoona Works and was rebuilt into a class M1b. The locomotive continued to be used for freight service until 1957, when it was retired from the roster.
Under the Whyte notation for the classification of steam locomotives, a 4-8-8-2 is a locomotive with four leading wheels, two sets of eight driving wheels, and a two-wheel trailing truck. Other equivalent classifications are: UIC classification: 2DD1 (also known as German classification and Italian classification) French classification: 240+041
These were both withdrawn from service by the mid-1920s. In 1942, the PRR built 123 2-10-4 "Texas" type locomotives based on C&O plans; class J now being unoccupied, it was reused for them. The PRR J1 was an improved version of its C&O counterpart with more pulling power. J1 - 2-10-4 freight locomotives. J28 - experimental 2-6-2 locomotives.
The L1s shared the boiler and many other components with the K4s 4-6-2 "Pacific" type, giving a total of 425 locomotives with many standard parts. [1]Although the L1s type was quite successful, it was very much eclipsed in PRR service by the larger and more powerful I1s/I1sa 2-10-0 "Decapods", which arrived in service only two years after the L1s and were very suited to the PRR's mountain ...
The locomotive's problems, the rapid decline of PRR's ridership since 1947 and the advantages of the emerging diesel locomotive ensured that #6200 would never be duplicated, but S2 still participated in the 1948 Chicago Railroad Fair with a T1 4-4-4-4 Duplex Steam Locomotive. [1] In August 1949, the locomotive suffered severe turbine damage.