504 King (304 King during overnight periods) 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 stationalso on Line 2and 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. The 504 King is the busiest line in the Toronto streetcar system. , the combined daily ridership of routes 504 King and 514 Cherry was 72,000 trips, which was significantly higher than two of the TTC's rapid transit lines, Line 3 Scarborough (38,570) and Line 4 Sheppard (49,070). The 514 route was merged into the 504 route on October 7, 2018. Route The 504 King route operates as two overlapping branches: 504A King streetcars operate from Dundas West station to Distillery Loop, travelling south on Dundas Street West and Roncesvalles Avenue, east on King Street West and East, and south on Cherry Street to Distillery Loop. 504B King streetcars operate from Dufferin Gate Loop to Broadview station, travelling north on Dufferin Street, east on King Street West and East, east on Queen Street East, and north on Broadview Avenue to Broadview station. In the west, route 504A King starts at Dundas West station on Line 2 Bloor–Danforth. From there, the route goes a short distance south of Bloor Street along Dundas Street West to Roncesvalles Avenue, where it continues farther south on Roncesvalles Avenue, crossing Howard Park Avenue and route 506 Carlton. 504A King passes the Roncesvalles Carhouse as it approaches Queen Street West and the Queensway. South of Queen Street West and the Queensway, the route turns east along King Street. At Dufferin Street, 504B streetcars from Dufferin Gate Loop merge with 504A streetcars to provide a combined service along King Street to Sumach Street. Continuing further east to Bathurst Street, the 504 enters a transit mall where automobiles have restrictions so as not to impede streetcar service. Continuing eastward past Spadina Avenue, the 504 route passes St. Andrew station at University Avenue and King station at Yonge Street, both on Line 1 Yonge–University. At Jarvis Street, the transit mall ends and routes