I switched to the default train.exe and the activity loaded.
MSTSbin didn't seem to like something.
I then tried each consist in explore until I found the one which crashed MSTSbin.
Then I removed a wagon at a time until I found the baddie.
It was the match wagon for Mike Simpson's breakdown crane.
The .wag file seemed OK so I opened the shape file.
At the end of the file I found an animation entries for Wheels1 and wheels2.
I removed these and at last MSTS loaded but the wheels did not turn.
I went back to the shape file and changed the Matrix lines from Wheels1 and Wheels2 to read Wheels11 and Wheels 21.
The wagon now ran correctly.
I'm not sure if the animation was faulty or if MSTSbin doesn't like Wheels1 and Wheels2 but at least I've found the cure.
If anybody else finds the same problem with any other wagon be sure to check out the shape file.
