This is the famous City Hall Loop.

When the TTC took over the transportation, from The Toronto Railway Company (in 1921) it set about connecting the Dundas East tracks with the Dundas West tracks. Tracks were built over the bridge across the Don River to Broadview, and over the gap between Victoria and Bay streets, but no through service was established.

In the west, Dundas cars operated from a loop at Runnymede Road, along Dundas Street, to Elizabeth, looping via Elizabeth, Louisa, James and Albert Streets.

When the massive new Eaton Centre development started construction in the early 1970s, the TTC stopped operation to City Hall Loop on a 'temporary' basis. The TTC claimed that the loop would reopen, providing direct streetcar service to the doors of the Eaton Centre, but that never materialized. The City Hall Loop operations moved east on January 6, 1975 to an on-street arrangement of Church, Queen and Victoria. This branch of the streetcar line faded to a rush-hour only operation, and then disappeared altogether on June 20, 1986.