For the first half of the 20th century, the Toronto Railway Company and the Toronto Transportation Commission responded to heavy ridership on certain lines by attaching a trailer to large streetcars, creating two-car trains that plied routes like Kingston Road, and, especially, Yonge.
As these trailers were unpowered, there needed to be a way to move these trailers through a carhouse and couple them to streetcars. These powered yard shunters were the answer. Y-4 was built by the TTC in 1922, while Y-10 and Y-12 were built in 1923, to pull trailers through the carhouse and assemble trailer-trains.
https://transit.toronto.on.ca/streetcar/4510.shtml
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