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.
University of California, Davis
UC Davis is also well known for its bus service, Unitrans, and its trademark London double decker buses. It has been in operation since 1968 and is believed to be the only general purpose (non-sightseeing) transit system in the U.S. to operate vintage double deck buses in daily service. The system is operated and managed entirely by students and offers fixed-route transportation throughout the city. There is also an inter-campus bus service that ferries back and forth between UC Davis and UC Berkeley twice daily, from Monday to Friday. Davis is also one of the busiest stations of the Capitol Corridor intercity railroad service operated by Amtrak between the Bay Area and Sacramento.