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Keystone (train) : ウィキペディア英語版 | Keystone (train)
The ''Keystone'' was a set of eight lightweight streamlined cars built by the Budd Company in 1956 for the Pennsylvania Railroad. The set comprised seven coaches seating a total of 574 passengers and a single head end power (HEP) generator car. The train was normally used in New York, New York, to Washington, D.C., service, making two round trips per day. The design was not a success and the cars were retired in 1968. == Design == The coaches were of a unique, split-level design, with the center portion of each car having a floor level two feet below that of standard coaches. This lowered the cars' center of gravity, allowing the train to safely take curves at higher speeds. The coaches were also built to a stressed-skin "Tubular" design, with the shell of the car providing all of the cars structural strength, without the normal heavy steel underframe. This resulted in cars weighing only 60% of what standard cars would weigh.〔 The split-level design, with short stairways between levels, proved unpopular with passengers, causing bottlenecks during loading and unloading.〔http://www.trainweb.org/phillynrhs/Budd.html〕
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