"Richard J." wrote in message
...
"Usually"? Which crashes between tube stock and mainline trains did
you have in mind for this statistical comment?

There was a collision in 1962 between a 38ts and a 501 at Watford High
Street, and another in 1986 between a 59ts and a 313 near Kensal Green. In
both cases the colliding Tube car was totally destroyed.