Merthyr Tydfil Station. Most trains from Merthyr are 'Pacers' and these terminate at Cardiff Central or Penarth, but occasional trains are Class 150 'Sprinters' as here, and these run through Cardiff to stations further west, such as (in this case) Bridgend.
<a rel="nofollow" class="external text" href="https://www.geograph.org.uk/profile/796">Dr Neil Clifton</a>
CC BY-SA 2.0
From <a rel="nofollow" class="external text" href="https://www.geograph.org.uk/photo/3655578">geograph.org.uk</a>