Philip
On Moderation
Ultimately removing engines that will weigh a couple of tonnes each isn't going to solve anything.
The simple reality is these trains simply aren't well suited for ongoing operation on British railways.
There are plenty of other routes they can go to where they would be suitable. They would be an upgrade compared with 170s on Cardiff to Nottingham; replacing 168s and LHCS on the Chiltern line; EWR to give a few examples.