DMU's and Full width Corridors between vehicles. Aka s-stock style.

[edwin_m]

I'd rather risk being thrown further given that I would be losing some momentum before I hit the floor than be hurled into a wall almost immediately.

If the deceleration that throws you continues afterwards then you would still be accelerating (relative to the train) so when you eventually hit something it would be that much harder*. That's one reason for the brace position on aircraft - your head doesn't have so far to accelerate before it hits the seat in front.

*and before someone points it out, yes I know this isn't an inertial frame of reference, but it seems the clearest way to explain it.

 

[HSTEd]

The velocity relative to the train will peak and drop off again however as the distance traversed increases (due to friction and air resistance etc)

And it seems likely that a continuous corridor train would have a dimension greater than the distance for peak impact velocity.