Editing Keystone (train) (section)

== 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|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.<ref name="about" />

The split-level design, with short stairways between levels, proved unpopular with passengers, causing bottlenecks during loading and unloading.<ref>{{Citation|title=The Edward G. Budd Manufacturing Company|url=http://www.trainweb.org/phillynrhs/Budd.html|website=trainweb.org}}</ref>