Fulwell Garage was previously known as Fulwell Depot and was originally the base for London United Tramways in south Middlesex. The trams were replaced by trolleybuses that started operating from Fulwell Depot in the 1930s. The trolleybuses were later replaced by AEC Routemaster buses and Middlesex's last trolleybus terminated here on the night of 8 May 1962, following a commemorative circuit of the Fulwell routes by Middlesex's first trolleybus, No.1 of the A1 class Felthams, known as "Diddlers". This vehicle is preserved in working order.