(13 Sep 2013, 6:58 pm)BJ10VUS wrote Hmmm, I'm not sure it'll be the 4?
Hopefully it will just end up in the numbered series - I have a strong dislike for random letters for normal routes. M2/M3, W5/W6 could also do with that approach. I'm not even really sure why M1/M2/M3 were singled out as 'Metrolink' - a massive range of GNE routes serve or connect Metro stations so always struck me as a bit random.