Portsmouth Street Tramways Company which was a subsidiary of The Provincial Tramways Company. In 1904, the last horse bus service was withdrawn. The tram system was purchased by Portsmouth Town Council and converted to electric operation in 1901, by which time it was operated as Portsmouth Corporation Transport (PCT). Early attempts to introduce motorised buses to the city, including in 1906 by the Isle of Wight Motor Bus Company, proved unsuccessful. In 1906 and again in 1911, the council turned down proposals to supplement the tram network with buses. However, in 1919 ten vehicles were introduced on a single route, beginning an operation that would last for almost 70 years. Council operations (1919–1986) PCT soon faced competition from two private operators, Portsmouth & District Motor Services Ltd and the Southsea Tourist Company, who ran bus services over routes covered by the tram network. Twelve vehicles were added to the fleet in 1924 and two new routes introduced. One of the new routes, which originally terminated at Cosham, was extended to Drayton in 1925 in competition with a route provided by Southdown Motor Services, which retaliated by running more journeys into Portsmouth. A change in legislation in 1927 saw the routes return to their original form. The corporation's livery, previously scarlet and ochre, was changed to red and white in 1931 in response to Portsmouth gaining city status four years earlier. The tram system began to decline in the 1930s. Trolleybus services replaced trams on one route in 1934, and by November 1936, all tram services in Portsmouth had been withdrawn. Bus and trolleybus services were reduced during World War II, when the city's dockyards were a target for bombing and its population depleted by evacuation and military service. Unusually, at this time there were two numbers (or letters for trolleybuses) for each route, depending on the direction. In 1946 an agreement was reached between PCT and Southdown to operate jointly on some routes. Leigh Park, which expanded rapidly after the war, was served for the first time in 1949; although this was intended to be a short-term measure prior to the introduction of trolleybus services, the route was never served by trolleybuses. A number of new vehicles were added to the bus fleet in the late 1940s and 1950s, and in 1958 one-person operation was introduced. Trolleybus operation in Portsmouth ended in July 1963. From 1963 until the late 1970s