I believe it should be added to London to Brighton if that ever came out. Then the Class 455 can be used on the Suburban routes. I don’t think that there is any use for the 171s as they are used only from Eastbourne to Ashford Int. I can see the need for the 313s because they are the only use for the 313s now that the 313/1s are gone from Great Northern so I can see why they are being added
