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PRR G5
The Pennsylvania Railroad G5s was a class of 4-6-0 steam locomotives built by the PRR's Juniata Shops in the mid-late 1920s. It was designed for passenger trains, particularly on commuter lines, and became a fixture on suburban railroads (notably the Long Island Railroad) until the mid-1950s. The G5s was the largest and most powerful 4-6-0 locomotive, except for a single Southern Pacific 4-6-0 that outweighed it by 5500 lb.〔http://www.byz.org/~morven/Railway32/steam/index.html〕
== History and Design ==
In the 1920s the Pennsylvania Railroad needed a locomotive for commuter trains. When the first G5s rolled out of the Juniata shops in 1923, the Pennsylvania Railroad hadn't built a 4-6-0 in more than two decades. Mechanical Engineer William F. Kiesel, Jr. who designed the engine used the boiler from an E6s Atlantic and designed one of the largest and most powerful ten-wheelers ever built. Smaller drive wheels than an Atlantic and the lack of a trailing truck put more weight on the drivers and produced an engine with great power and acceleration but a lower top speed. The 4-6-0 wheel arrangement could provide sufficient tractive effort, (41,000 lbs of tractive force) but at the same time, allow the locomotive to accelerate the train more quickly. Such a design was ideal for the frequent stops on PRR commuter lines. 90 G5s locomotives were built for the PRR between 1923 and 1925 at the railroad's Juniata Shops in Altoona, Pennsylvania. Thirty-one more were built between 1924 and 1929 for the Long Island Rail Road, then a PRR subsidiary. Like the I1s Decapod the G5s was infamous among enginemen for rough riding; locomotive historian Alvin Staufer said "Riding qualities were sacrificed for power when Pennsy designed these G5s Ten Wheelers."〔http://prrsteam.pennsyrr.com/prrg5.php〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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