£27.4 miliwn ar gyfer rheilffordd Treherbert i ganiatáu gwaith seilwaith ar hyd y rheilffordd i gyd, gan gynnwys dyblu'r trac o'r gogledd o Ynyswen i'r de o Dreorci a'r gogledd o Lwynypia i dde Dinas.  Mae'r cynllun yn cynnwys platfformau newydd hefyd.
£27.4million for the Treherbert line to allow sufficient infrastructure works along the full length of the line, including track doubling from north of Ynyswen to the south of Treorchy and north of Llwynypia to south of Dinas.  The scheme also includes new platforms.£23.7million for the Aberdare line for track doubling, new platform construction and other infrastructure work to allow the service to be increased to four trains per hour along the full length of the line from Abercynon to Aberdare. Track doubling will take place between Aberdare and Cwmbach, Fernhill and Penrhiwceiber, and north of Abercynon. The scheme includes a new platform, new step-free access and new waiting rooms at Aberdare, and an enhanced interchange at Abercynon.£19.5million for the Rhymney line to undertake track doubling south of Rhymney, north of Tir Phil and around Bargoed. The funding will also be used for other infrastructure work to allow the service to be increased to four trains per hour and provide new platforms, including step-free access and a new waiting room at Rhymney.£27.3million will also be allocated to the Taff’s Well Depot scheme for land purchase, road build and rail access, providing serviced land for a new high quality depot facility which will improve Metro service reliability and enable the maintenance of the modern vehicles.