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The Toronto Railway Company operated the Toronto Railway Company Belt Line from 1891 until 1921, when its operations were taken over by the Toronto Transportation Commission. The TTC continued operating the line until 1923, when it was broken up into separate routes, the Spadina streetcar line, the Bloor streetcar line, the King streetcar line, and the Sherbourne streetcar line.
The present-day 504 King streetcar line is a lineal descendant of that original King line. The Bloor streetcar was extended from Jane Street to Woodbine Avenue, and remained in operation until it was replaced by the Bloor-Danforth Subway line in 1968. The Spadina line was replaced by buses in 1948. The current 510 Spadina streetcar line, completed in 1997, uses new tracks, new rolling stock, running on a dedicated right of way, and has nothing in common with the original Spadina line other than location.