Starting some three miles north of Merthyr, the railway runs along the full length of the Ponsticill Resevoir. It is a narrow gauge railway which has been constructed on the site of the original standard gauge Brecon and Merthyr Railway. The current railway has been mostly constucted to serve as a tourism railway to allow people access to some parts of the Brecon Beacons without the need for a car.
The railway uses 3 steam engines to tow the stock - two from the USA and one from Germany.
More information on the Brecon Mountain Railway: