The Yorkshire Engine Company (YEC) was a small independent locomotive manufacturer in Sheffield, England. The company was formed in 1865 and produced locomotives and carried out general engineering work until 1965. It mainly built shunting engines for the British market, but also built main line engines for overseas customers.

The Chattenden and Upnor Railway was a narrow gauge railway serving the military barracks and depot at Upnor, Kent and associated munitions and training depots. It started life in the early 1870s as a standard-gauge railway. The 2 ft 6 in narrow gauge working began in 1885, initially in a mixed gauge formation with the standard gauge, and post circa 1903 2 ft. 6 in. gauge exclusively. In the latter form the line continued in use until the end of 1961.