Transport for Wales has now electrified the railway lines from Aberdare to Pontypridd and Merthyr Tydfil to Abercynon.
Over 60,000 metres of Overhead Line Equipment has been energised across the whole South Wales Metro rail network.
New Citylink Class 398 tram-trains are testing on Metro routes and the £100 million Metro Depot at Taff’s Well is near completion.
Karl Gilmore Rail Infrastructure Director at TfW said, “This is yet another key milestone in the transformation work of our core valley lines as we continue to progress in delivering the South Wales Metro.
“It’s really exciting to see more railway lines electrified in South Wales and through delivering the Metro we’ll be providing people with a more sustainable option of travel.
“Taff’s Well depot is the home of our new tram trains and it’s fantastic to see these light rail vehicles out on test which will soon be in passenger service”.