A number of you got last week's which I thought was hard. There were some good early guesses in the right direction which I reckon helped.
This week, I'm having you work even harder. I took the picture myself yesterday and had to do a double-take when I saw it pulling into the platform. Me and a number of other passengers were about to get on the train, when we realised there was something special about it, as it had loads of people in it having breakfast and generally acting as though it was a kitchen or office and not a train.
Once again, there's no prizes for getting it, just the satisfaction of knowing you were right. So you need to guess where it was taken from and tell me a bit more about the Tube train itself.
Try not to look at the comments in front of you before making your guess. Have fun!