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.
Abner Doble
With the demise of his company Doble went on to work as a consultant for other engineering companies globally. During the 1920s and 1930s Doble's engines were tried in steam buses. The first were tested in 1926 by International Harvester, using a Doble Model G engine, and the Detroit Motorbus Co, in a double decker, with a Doble Model H engine. A second Detroit bus had a Doble steam engine added in 1927 and at least one of them covered some . In 1929 a Doble Model H was installed in a Yellow Coach for General Motors. This was followed by another Model F in a Fageol bus.