I'm not sure how plastering the word England on a 250ft long moving Union Jack flag can be seen as anything other than nationalism to be honest.
I don’t really see it as nationalism (no one seems to accuse Scotland of that as regards the ScotRail livery). However I still dislike it. The GBR title is a mouthful, and no we don’t need a train livery based on a flag. It just feels symptomatic of a country that is completely unsure of itself. Who is it aimed at? Joe Commuter who takes the train to work from Haywards Heath every morning knows they are in Britain.
I’d have been quite happy having a few regional liveries TBH. GWR’s would be fine for western, a variation of Southern’s for Southern (though this livery has had such a long life it is probably time for a change here), keep LNER’s for that route, etc etc etc. In essence I’d prefer something that shouts “railway” and/or “local area” rather than a pastiche flag.
I agree with the post suggesting the whole thing feels like a leftover from Boris Johnson. I suspect it will quickly become unpopular once people realise that this won’t be the start of some golden age for rail travel, but rather just a continuation and cementing in of the DFT micromanagement we have seen for some time now, especially post-Covid.