Municipal government of Toronto
On January 1, 1967, several of the smaller municipalities were amalgamated with larger ones, reducing their number to six. Forest Hill and Swansea became part of Toronto; Long Branch, Mimico, and New Toronto joined Etobicoke; Weston merged with York; and Leaside amalgamated with East York. This arrangement lasted until 1998, when the regional level of government was abolished and Etobicoke, North York, East York, York, and Scarborough were amalgamated into Toronto the "megacity". Mel Lastman, the long-time mayor of North York before the amalgamation, was the first mayor (62nd overall) of the new "megacity" of Toronto, which is the successor of the previous City of Toronto.
Toronto and Mimico Electric Railway and Light Company
On August 16, 1922, the City of Toronto formally acquired the T&YRR lines. The plan was that the city portions of the T&YRR radial lines would be incorporated into the TTC, and the portions outside the city would be managed by Ontario Hydro as the Hydro-Electric Railways: Toronto and York Division. 
On November 1, 1922, Hydro-Electric Railways took over operation of the T&YRR lines outside of the city limits. The TTC replaced the radial line between Sunnyside and the Humber River with a double-track streetcar line. After 1922, Hydro changed the gauge of the Mimico line between Humber (the line's new eastern terminal) and Port Credit from Toronto gauge to standard gauge. HER introduced new standard-gauge cars and doubled service frequency.