Cardiff Queen Street railway station is a railway station serving the north and east of Central Cardiff, Wales. It is the fourth busiest railway station in Wales. It is located near the major thoroughfare of Queen Street and is one of 20 stations in the city. Along with Cardiff Central, it is one of the two major hubs of the Valleys & Cardiff Local Routes local rail network. The station and its services are run by Transport for Wales.

The South Wales Valleys are a group of industrialised peri-urban valleys in South Wales. Most of the valleys run north–south, roughly parallel to each other. Commonly referred to as "The Valleys", they stretch from Carmarthenshire in the west to Monmouthshire in the east; to the edge of the pastoral country of the Vale of Glamorgan and the coastal plain near the cities of Swansea, Cardiff, and Newport.