One thing though, IMHO it looks a little too clean at the moment. It would probably have looked (slightly) grubbier due to the steam and smoke from trains combined with the relatively confined environment.
I might be able to manage this by just using photoshop, part of the trouble with 3D stuff is that it all looks too clean and unnatural.
I also found this pic of Kelvinbridge Station... fancy giving that a go?
I hear the sound of a gauntlet hitting the floor... Not a bad refence photo though, might change the design of my lights to match what was at Kelvinbridge on your photo. I'll maybe paste in those fine gentlemen at some point. And of course!! Some furniture (benches and signs) - damn I knew something was missing!!
Any other reference pics would be fantastic, there's not a huge amount to go on at Virtual Mitchell.