Opened : 1909

Closed : Tongwynlais - Rhydyfelin 1931 (passengers), Nantgarw - Coryton 1952 (goods). Heath Junction - 1984 (rerouted)

Engineering Code: CRY

Length 9m 40c

Route :

The Cardiff Railway was planned as a rival to the Taff Valley Railway in terms of extracting coal and for passenger transport. At the time it had backing of the Rhymney Valley Railway, sharing RVR track south of Heath Junction. Full development of the line was prevented by litigation on the part of the TVR and financial difficulties. The northern section from Taff's Well to Nantgarw was the last of the currently disused track to be abandoned, serving Nantgarw Colliery. The only remaining section in use is the suburban spur from Heath to Coryton. A passenger service ran as far as Tongwynlais until the 1950's.

	The section between the junction with the TVR and te abutment of the Rhydyfelin viaduct is open and accessible for about 500m. The area is woodod, but criss-crossed with paths. This embankment covers a large area, as it had to cater for a number of sidings. The bank gradually tapers down to twin track ay the viaduct. Through this bank, a tunnel carries the TVR Boat Colliey and Rhydyfelin Tinworks siding. This sinusoidal tunnel is about 150m long. Of the Rhydyfelin viaduct, the western abutment is the only remaining substantial structure, visible from the A470 on the other side of the river. Within the river, two circular stubs are all that remain if the viaduct itself.
	Between Rhydyfelin and Upper Boat Roundabout on the A470, the trackbed has disappeared beneath the main road. The west abutment of the Dynea road bridge still stands by carriageway. About 2km have been lost.
	A short section of trackbed is visible at the old Groeswen road bridge, just off the Upper Boat roaundabout. For about 1.5 km to the soiuth, the trackbed has been covered by new industrial estates, but the course still forms the border between two sections of the estate.
	Recent road improvements have caused the removal of the A 4054 Oxford Street bridge. The trackbed for about 900m south of this site is open as a path as far as the A4054 Cardiff Road bridge, originally an angled girder bridge.
	Glan y llyn to moy rd
	moy rd to cemetery rd
	The Cemetery Road bridge has been filled in, the only evidence is the black brick wall by the roadside. To the south, the cutting has been infilled whith a single house built on it. There is a partially buried bridge where a quarry access trach passed over. The rest of the cutting is heavily overgrown and partly infilled, emerging as a slight depression in the trees onton the realigned Cemetery road just north of the A470 overpass. The trackbed south of here has been buried under the Castell Coch junction, including the short Tongwynlais tunnel, which has been completely dug out. The sit was approximately where the roundabout is now. Where the road is spilt level, the upper carriageway follows the trackbed around Tongwynlais as far as the site of the station, which was closed in 1953.
	The station site has been lost beneath the A470. To the south, about 250m of trackbed remains between the picnic site and Tongwynlais recreation ground. At the south it is cut off by the M4. Between the M4 and Coryton Station, the trackbed has been preserves as a park. The use of a ballast path, rather than tarmac adds to the attraction.
	The section between Coryton and Heath remains in use, reduced to single track. The junction with the Rhymney line was moved 500m north in 1984 to allow some land to be sold off for housing.