[2] The Long Branch route originally operated from 1935 to 1995, and was numbered "507" when the CLRV streetcars were put into service beginning in 1979.

[3] On November 19, 2023, the TTC split the 501 Queen route, rebranding the portion west of Humber Loop as 507 Long Branch.

Starting from that date, the TTC replaced the radial track to Long Branch with a double-track streetcar line.

[3] On January 1, 1973, passengers could transfer between the Long Branch and Queen streetcars at Humber Loop without paying an extra fare.

To address these problems and make service more predictable for riders, the TTC split the 501 Queen route.

[12] From June 21, 2020, most 501 Queen streetcars operated the full route between Neville Park and Long Branch loops.

This ended the split in 501 Queen service at Humber Loop where passengers from Long Branch had to change streetcars to continue downtown.

[15] However, as of October 2023[update], the track west of Sunnyside Loop was still closed due to ongoing construction.