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.
Double-decker bus
Sweden bought in 1965 50 Leyland Atlantean double-decker buses with Park Royal bodies. Leyland claimed they were the first double-decker buses with one man operation. They had two staircases and two pairs of doors. The Atlanteans were not replaced at the end of their revenue service life in 1974. Recently, however, in 2011 double-deckers returned to Sweden on revenue duties with VDL Synergy on in the SL 676 Stockholm Östra - Norrtälje line. Norrtälje is located around 70 km north of Stockholm.