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The actual overturning speed of a train is much higher than the limits set by the speed formula, which is largely in place for passenger comfort. There is no hard maximum unbalanced superelevation for European railways, some of which have curves with over 11 inches (280 mm) of unbalanced superelevation to permit high-speed transportation. [15]
The Milwaukee F7s are accepted as the fastest steam locomotives by a different measure—scheduled speed between stations. In 1939, shortly after they were introduced into passenger service, the Twin Cities Hiawatha schedule was modified such that the engines would need to run the 78.3 mi (126.0 km) between Portage and Sparta, Wisconsin in 58 ...
GE steam turbine locomotives; Gov. Stanford; Grand Trunk Western 5629; Great Northern 2507; Great Northern 2584; Great Northern F-8; Great Northern H-5; Great Northern M-1; Great Northern O-1; Great Northern P-1; Great Northern P-2; Great Northern Q-1; Great Northern S-1; Great Northern S-2; Great Smoky Mountains Railroad 1702
Most powerful steam locomotive ever static tested. PRR S1: Pennsylvania Railroad: 6100 Altoona Works: 1939 Steam 6-4-4-6: 487 tonnes (537 short tons) 340 kilonewtons (76,403 lbf) 5,369 kilowatts (7,200 hp) Fast passenger steam locomotive; the magazine Popular Mechanics cites 1941 a speed of 133.4 mph (214.7 km/h) PRR S2: Pennsylvania Railroad: 6200
No in-house tests were made with a dynomometer, but estimates from the Altoona test rated 6110's drawbar pull at 4,100 horsepower at 100 mph. [16] No prior class of steam locomotives in numbers could develop over 4,000 drawbar horsepower at this speed, while the only class which could match this figure was the later New York Central Niagaras.
While economical at speed, the locomotive was highly-uneconomical at lower speed. The turbine used less steam than conventional locomotives above 30 mph (48 km/h), but below that the locomotive used too much steam and fuel. The boiler normally operated at 310 psi (2.1 MPa), but at low speed the pressure could drop as low as 85 psi (0.59 MPa).
He believes this is the first claim of over 100 mph (160 km/h) for a steam locomotive in which the surviving documentation strongly indicates its accuracy, and thus that #6402 was the record holder for steam locomotive speed for at least a short time.
Its high-speed capability was such that many have claimed that the S1 exceeded on multiple occasions the 126 mph (203 km/h) record steam locomotive speed set in 1938 by the British LNER locomotive 4468 Mallard. The engine was claimed to have exceeded 152 mph (245 km/h) on the Fort Wayne-Chicago run, as it was reported that the PRR received a ...