Pennsy Keystone Tubular Train

Pennsy Keystone Train promotional photo by A.F. Sozio.

Budd mockup showing the sunken living room.

Penn Station, photo by A.F. Sozio
From: http://www.mas.org/50-years-after-the-demolition-of-penn-station/

I rode this train with my parents in the early sixties between NYC and D.C. It was very interesting to look down the train as we went around curves, but the diaphragms between cars made for a lot of noise.