[1][3][4] After its creation in 1921, the TTC (then the Toronto Transportation Commission) combined, amalgamated and rationalized the tracks, routes, and rolling stock of several privately held streetcar companies.
[1] Because the line has no turning loops, the Spadina route used double-ended vehicles and required crossovers to change direction.
The TTC inherited them from the Toronto Civic Railways, and designated this series of streetcars as Class J.
The Class J streetcars required two-man operation, had rear-door entry/exit and front-door exit, and used Pay-As-You-Enter fare collection.
[6] Spadina Avenue used to have a tree-lined, centre boulevard containing streetcar tracks in the middle separate from road traffic.
[6] After the demise of the Harbord route, only the tracks between King and College streets were retained along Spadina Avenue,[9] which could be used for diversions.