At an early date the Barry directors were considering a further extension to their network, to capture traffic in the Rhymney Valley. A proposal reached the 1888 session of Parliament to build from near St Fagans to Llanishen on the Rhymney Railway, but was turned down in the Lords' Committee. A second attempt was made in 1889 for an independent line from near Cogan to Cardiff, and also a junction with the Rhymney Railway north of Caerphilly. this too was withdrawn by the Barry Railway, but significant concessions were obtained.