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
In March 2017, the first three-door, two-staircase double-decker bus in Singapore was introduced by Tower Transit for a six-month trial period.