In 1921, the Toronto Transportation Commission (TTC) was created to integrate and operate the Toronto streetcar system. It inherited the infrastructure of two separate streetcar operators: the Toronto Railway Company (TRC) and Toronto Civic Railways (TCR). The TTC immediately embarked on a program to connect the TRC and TCR lines into one network. The TTC had to rebuild most of the track to provide a wider devilstrip so that the wider Peter Witt streetcars it was ordering could pass without sideswiping. Between 1938 and 1945, it placed five orders for air-electric PCC streetcars to replace the old, wooden streetcars of the TRC, and to address rising ridership. Between 1947 and 1951, the TTC placed three orders for all-electric PCC cars, with one order equipped with couplers for multiple-un