Across London... and back... and back again

I went to London today to visit the Postal Museum but I'll talk about that in a separate post. Before I went to the museum I did some rail travelling across the capital (of course!) I went from West to East and then travelled back West... and then went back East to the museum. I managed to see both new EMUs (Classes 710 and 717) and visit some new stations. You can see my rail adventure photos here.