"Mountain locomotive" redirects here. For Mountain-type locomotives in general, see 4-8-2. For locomotives that climb mountains, see Rack railway § Rolling stock.
Pennsylvania Railroad M1
PRR M1a on display at the 1939 World's Fair. Pipe on the smokebox and box behind stack are components of the feedwater heater.
Type and origin
Power type
Steam
Builder
PRR Altoona Works, Baldwin Locomotive Works, Lima Locomotive Works
#6755 preserved, one tender preserved and set to be used on T1 new build, remainder scrapped
[1]
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. Although built for both passenger and freight work, they spent most of their service lives hauling heavy high-speed freight trains. Many PRR men counted the M1 class locomotives as the best steam locomotives the railroad ever owned.
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