Jack, that's a wonderful shot. You captured the Metro perfectly with just the right amount of blur. How about sharing the metadata? I'd be interested to know what shutter speed you used. Whatever it was it was perfect.
Perfection!!! Just the right amount of blur on the train. It shows motion but still looks like a train. And everything else in the photo is nice and sharp and perfectly in focus. Did you get "questioned" in any of the stations while photographing?