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.
Crossley Motors
By the late 1920s the market for hand-made cars began to disappear and the company moved into the bus market and launched its first model, the Eagle single decker in 1928. Although some double deck bodies were fitted to the Eagle, the Condor launched in 1930 was the first chassis to be designed for double decker bodies. The Condor could also be ordered with a diesel engine, made by Gardner at first, and became the first British double deck bus to be offered with diesel power. The big selling pre-war bus was the Mancunian with first deliveries in 1933. This was available as both a double and single decker.