It's good old (new) line 14, of course, with me right up there at the front of the train. Hey, I'll have to take some pics from the back for a change, now there's a thought.
The magic is that you have a pretty good reflection of yourself and, if you're lucky, a couple of innocent bysitters, and then there's this crazy tunnel and sometimes trains whizzing towards you at the speed of light!
A double vision, a tunnel vision that's second to none. And it's kinda scary to be plastered up against the front windshield as the train thunders along. You just hope they got the tracks right... ;~S