The S-class was a class of 18 trams built by Duncan & Fraser, Adelaide for the Melbourne, Brunswick & Coburg Tramways Trust (MBCTT). The first 12 entered service in 1916, numbered 1 to 12. All passed to the Melbourne & Metropolitan Tramways Board (MMTB) on 2 February 1920 when it took over the MBCTT, becoming the S-class and renumbered 154-165.S Class Vicsig
The other six were built to a slightly modified design, being delivered to the MMTB between 1920 and 1922. Originally numbered 19, 20, 21, 139, 23, and 171, they were renumbered 166 to 171 respectively and classed S1.
In 1941/42, 14 were rebuilt for one-man operation, seven for the isolated Footscray network and seven for all night services on the main network. The Footscray cars were returned to crewed configuration in 1947.
Preservation One has been preserved: 164 as part of the VicTrack heritage fleet at Hawthorn depotMelbourne & Metropolitan Tramways Board S Class No 164 Hawthorn Tram DepotM&MTB S No 164 Tramway Museum Society of Victoria
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