Man do I ever love train stations!
Every time I visit Europe, I stop in several train stations and take a lot of photos. I'm not sure when this thing started, or why, but it is what it is. I love them, and photograph them every chance I get. When I was in London back in January, I stopped in Baker Street Station one day and wandered around a little bit, firing away and having fun.
Baker Street Station is particularly awesome, in my opinion, just because it has that beautiful brick everywhere and just looks a bit like a classic old train station. Pretty much all the major lines run through there at some point (or so it seems), so it's a quick and easy stop when jetting around town to different spots. You're bound to end up here at some point, so stop and fire a few!