There actually would have been enough space between the wheels and under the platform to lay lengthwise and not be hit.
That is one of the things that varies station by station, some have a bit of room, some not. Also the garbage trenches that some have ducked into vary in depth, you get about 3" of clearance under the train, plus whatever the depth is.
If he was closer to the far end of the track, he might of been able to outrun it, usually at the ends of the platforms there are duckouts with ladders to get to a safe place.