The 503 Kingston Rd streetcar route operates between the area of Kingston Road and Victoria Park Avenue, and the area of King Street West and York Street, generally in an east-west direction.  It serves the King Station on the Yonge-University-Spadina Subway, and it also passes within one block of the Union and St. Andrew Stations on the Yonge-University-Spadina Subway.  Union Station is an accessible subway station.

One single service is operated:  the 503 (Victoria Park-York) branch operates during the peak periods, from Monday to Friday only.

Westbound 503 YORK VIA KING

These streetcars operate from Bingham Loop (on the west side of Victoria Park Avenue, north of Kingston Road) via south on Bingham Avenue, west and south on Kingston Road, west on Queen Street East, southwest and west on King Street East, south on Church Street, west on Wellington Street East, and west on Wellington Street West to York Street.

Eastbound 503 VICTORIA PARK

These streetcars operate from Wellington Street West and York Street via north on York Street, east on King Street West, east and northeast on King Street East, east on Queen Street East, north and east on Kingston Road, and north on Victoria Park Avenue to Bingham Loop.

All streetcars on the route serve local streetcar stops along the route.