“The ankle-view train”

An article about the Pennsylvania Railroad’s new Keystone train in October 1956 Trains magazine (reprinted in 2015 in Classic Trains’ special edition More Trains of the 1950s) was titled “The Ankle-View Train” because of the unusual perspective the low-profile coaches afforded their riders when stopped at high-level platforms. This scene at Newark, N.J., explains all.
Pennsylvania Railroad photo