Cockfosters, Upminster, Amersham - they mean something. C5 is a meaningless number. If you like a sterile meaningless world fine but I prefer some local identity to transport systems instead of a bland, faceless, if efficient, teutonic style. S4 Frankfurt, S4 Hamburg, S4 Munich - it might all be efficient and easy to use etc blah blah blah but it's downright dull and ultra boring Give me Кольцева́я ли́ния, Bakerloo Line or something with local meaning to some sterile number any day. Keep your numbers for the bus routes. As for Thameslink - I'm quite happy with that as a name. Give it a number and I'll ignore it and still call it Thameslink.