Double-decker bus
The first commercial horse-drawn double-decker omnibuses were introduced in England in 1847 by Adams & Co. of Fairfield, Bow, then improved upon by John Greenwood, who introduced a new double-decker in 1852.
Bombardier Double-deck Coach
The ancestry of these coaches can be traced back to double-deck coaches built by WUMAG at Görlitz for the Lübeck–Büchen–Hamburg railway in 1935. They were push-pull trains with a cab car that could control the steam locomotive at the other end of the train.