TfW commences tests on Stadler Citylink tram-trains on Core Valley Lines, UK April 23, 2025 | Europe News, News Transport for Wales (TfW) has commenced tests on its class 398 Stadler Citylink tram-trains on the recently electrified 170-km-long Core Valley Lines from Cardiff to Merthyr Tydfil, Aberdare, and Treh... This content is available to only subscribers. Username or E-mail Password Remember Me Forgot Password