The Great Western Railway and the Taff Vale Railway made great use of the system, and in 1905 the Barry Railway experimented with it also, opening new stops at St Y Nyll, a short distance north of Tynycaeau Junctions, and Tonteg, between Efail Isaf and Pontypridd. The Barry Railway purchased two steam rail motors from the North British Locomotive Co; they were very similar to contemporary GWR railmotors. It ran the motor cars between Barry and Cardiff (via Tynycaeau Junction). The service started on 1 May 1905, with the motor cars intermingled with conventional trains. It appears that the Tonteg platform was indeed very short, so that conventional trains were not allowed to stop, but St Y Nyll seems to have been long enough for ordinary trains to use it.