chuuchuu🥖Working on a thing. Are there any other cities that require you to cross town to take your next train? I’m ignoring London for now.
Matt[ingham] 
@chuuchuu Glasgow (Central < > Queen Street) springs to mind.
Manchester could also be considered as (I think) there’s only one train an hour from Piccadilly to Victoria & some connections on National Rail Enquiries show you having to make your own way across the city centre.