18tph of fresh air for most of the day, what’s the obsession with running dozens of short (2 or 3 car) trains?
Then we have issues with capacity or lack of, the valleys can take 6 cars in the main, inside the peak and on high days of course run a more frequent service but we have no four car trains with a handful of passengers on outside the short peaks.
We all know passengers will jump on end first train that says “Cardiff” on, whether its destination is QS, Bay or Central.
I’m sure the people who plan these ideas have never been out and about on the network, or spent any time with the great British traveling public.