- How many carriages are there?
- How fast is the train travelling?
- Is the track straight or curved?
- Is the train in a cutting, in a tunnel, under a bridge, on an embankment?
- Are you standing or sitting?
- If sitting, are you facing the direction of travel?
- Are there any other passengers (who may fly forward and hit you)?
I know, but statisitically I would like to find out how many survivors are at the end of the train, surely the likelihood of surviving must be greater at the back than the front.
Have a look at this, second chapter, 'Details of incident', it doesn't tell you exactly what your after, but it does describe how the carriages behaved, bearing in mind, this was in a tunnel, and it hit a brick wall, but you may be able to do some calculations.