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.
Scania Metropolitan
The Scania Metropolitan was the first double decker bus model built jointly by MCW and Scania. It was built between 1973 and 1978.