The Barry Railway Company was a railway and docks company in South Wales, first incorporated as the Barry Dock and Railway Company in 1884. It arose out of frustration among Rhondda coal owners at congestion and high charges at Cardiff Docks as well the monopoly held by the Taff Vale Railway in transporting coal from the Rhondda. In addition, the Taff Vale did not have the required capacity for the mineral traffic using the route, leading to lengthy delays in getting to Cardiff.

The Brecon and Merthyr Tydfil Junction Railway (B&MR) was a railway company in Wales. It was originally intended to link the towns in its name. Finding its access to Merthyr difficult at first, it acquired the Rumney Railway, an old plateway, and this gave it access to Newport docks. This changed its emphasis from rural line to mineral artery.