In the west, routes 504C King and 505 Dundas start at Dundas West station on Line 2 Bloor–Danforth. From there, both routes go a short distance south of Bloor Street along Dundas Street West to Roncesvalles Avenue, where route 505 Dundas route splits off to continue eastbound on Dundas Street. Route 504A King continues further south on Roncesvalles Avenue, crossing Howard Park Avenue and route 506 Carlton. 504C King passes the Roncesvalles Carhouse as it approaches Queen Street West and the Queensway, where it crosses route 501 Queen.