Capital City Red was the branding of bus services 17 and 18 in Cardiff. The route runs from the city centre to the west of the city, serving the Canton, Ely and Caerau districts.

Ely is a district and community in Cardiff, Wales. It is to the north of Cowbridge Road West. Caerau defines the boundary to the south as does River Ely to the east and in part to the north.