The videos and photos in
this article are the problem (keep scrolling to the end).
Civil servants at the DfT should look at the videos and photos in that article and then say there's no need for extra stock in Wales for another 2 years and that passenger growth in Wales compared to other regions in England isn't a problem needing more stock now.
Also videos
here and
here
The first video is used to illustrate an article on disruption on the valleys but is not a valley lines service, it's a 158 from Newport to Cardiff.
More articles and videos from the summer demonstrating overcrowding in SE Wales:
here and
here "Trains are now so full passengers are standing in the toilets"