The first trolleybus route commenced operating on 1 October 1933 between East Perth and West Leederville station via Wellington Street.

[3][4][5] In the late 1940s, it was proposed that trolleybuses replace tram routes to Victoria Park, Welshpool, South Perth and Como.

[4] On 8 August 1951, trams were replaced on the Mount Hawthorn line from William Street in the city, The Claremont route was extended along the Stirling Highway to the Swanbourne Fire Station and Wembley routes along Louth Road and Dumfries Road to Floreat Park.

In the same year, the Swanbourne route was replaced by motor buses in connection with road works associated with the interchange at the city end of Narrows Bridge.

[3] In 1950/51, 50 Sunbeam F4s entered service; 10 bodied by Commonwealth Engineering in Sydney with the balance under sub-contract by Boltons in Perth.