The 508 Lake Shore is an east–west streetcar route in Toronto, Ontario, Canada, operated by the Toronto Transit Commission (TTC). The route serves the downtown financial district from the western limit of the city, and operated as a weekday rush hour service only. The route was started as an experiment in 1992, suspended in June 2015 due to a streetcar shortage, and reintroduced in September 2019. It was suspended again on March 24, 2020, due to low ridership during the COVID-19 pandemic. Effective October 30, 2023, 508 Lake Shore service resumed after completion of infrastructure work west of Roncesvalles Avenue.

504 King is an east–west Toronto streetcar route in Ontario, Canada. It serves King Street in Downtown Toronto as well as Broadview Avenue on the east end and Roncesvalles Avenue on the west end of the line. The route consists of two overlapping branches: 504A between Line 2 Bloor–Danforth's Dundas West station and Distillery Loop, and 504B between Broadview station – also on Line 2 – and Dufferin Gate Loop. The two branches overlap on King Street between Dufferin and Sumach streets, both passing St. Andrew station and King station on subway Line 1 Yonge–University.