These were that the Taff Vale Railway would agree running powers (except for passenger trains) between Cogan and Walnut Tree Junction over the Penarth and Radyr lines. At Walnut Tree the Rhymney Railway had a junction with the Taff Vale Railway, in fact giving access to the Rhymney's original main line there. Moreover, running powers would be granted for all classes of train from Cogan to Penarth Curve South Junction, where connection was made with the Great Western Railway main line. From this point the GWR had its Riverside Branch, opened in 1884, running down the east side of the River Taff into an important industrial area; both the Barry and the Taff Vale were given running powers over this line, which was to be made suitable by the GWR for passenger operation.