You wouldn't go to Cardiff on a train from Aber to London even if using the Marches! You'd go via Newport.
As for USP, that's easy: no changes. It's amazing on say 2 hourly Chester to Brum how comparatively few Chester to Cardiff pax there are, despite an easy change at Shrewsbury. The intermediate Cardiff services have a lot of through traffic.
As for USP, that's easy: no changes. It's amazing on say 2 hourly Chester to Brum how comparatively few Chester to Cardiff pax there are, despite an easy change at Shrewsbury. The intermediate Cardiff services have a lot of through traffic.