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A two-rail locomotive must both avoid shorting the two running rails, and must also collect current from both sides independently. For a three-rail locomotive the wheels and axles are typically metal and the metal chassis may be used as a ground connection. This has the advantage that all wheels, including bogies, act as pickups.
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.
The Pennsylvania Railroad (PRR) A3 was a class of 0-4-0 steam locomotives built at Altoona Works between 1895 until 1905. The A3s were used as switchers for railroad cars at various PRR yards. Later, some A3s were converted to A3a, which had saddle tanks instead of tenders. [ 1 ]
The Pennsylvania Railroad K4 was a class of 425 4-6-2 steam locomotives built between 1914 and 1928 for the Pennsylvania Railroad (PRR), where they served as the primary mainline passenger steam locomotives on the entire PRR system until late 1957. Attempts were made to replace the K4s, including the K5 and the T1 duplex locomotive.
In 1944 Baldwin outshopped an S2 class 6-8-6 steam turbine locomotive for the Pennsylvania Railroad. Between 1947 and 1948 Baldwin built three coal -fired steam turbine-electric locomotives of a unique design, for passenger service on the Chesapeake & Ohio (C&O), who numbered them 500 to 502 and classified them M-1 .
The 21 steam locomotives owned by the PRSL were from the PRR subsidiary WJ&S. [3] They all consisted of PRR classes. Before dieselization the PRSL was more apt to lease its motive power from either of its parent railroads as it completely lacked any heavy passenger locomotives (like 4-6-2 Pacifics ).
During World War II, the PRR needed heavier locomotives to pull freight and military equipment, but wartime restrictions prohibited the development of a new locomotive design. In response to this the Pennsylvania Railroad borrowed a 2-6-6-4 Class A of the Norfolk and Western Railway and a 2-10-4 from the Chesapeake and Ohio Railway. Both ...
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 ...
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