Cheers for comment all. I didn't want to completely freeze the train, just enough to see a small bit of detail.
Tone mapping? Blimey, small steps, small steps til I build up to that one I think.
I am going to mess about a bit with the train one to see if I can improve it somewhat.
The effect I was after on the cars was a lit up edge with very dark remainder, so you can see what it is without really seeing the whole car (if you get my drift)
My trouble is, I want to run before I walk. Not a bad way to be at nearly 56. I am way ahead of youngsters in my office regarding use of IT (probably cuz they have a life?)