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
Strathcona County Transit of Strathcona County, Alberta started a pilot project in September 2010 which explored using different high-capacity bus types to carry more passengers on high-demand commuter routes between Strathcona County and Edmonton. This involved a one-year lease of an Alexander Dennis Enviro500 from the manufacturer. After completing a year of testing between September 2010 and October 2011, a firm order of 14 Enviro500s was placed in 2013 for their service between Sherwood Park and downtown Edmonton, with the first arriving in late August. Five more buses were ordered in 2016, bringing the fleet of double-deckers to 19 as of 2017.