the latest figures for this football season show that btp has recorded 630 football-related incidents .
groups of football fans are responsible for thuggish behaviour on trains on a weekly basis , a senior police officer has said .
the warning by british transport police -lrb- btp -rrb- chief constable paul crowther came ahead of a summit organised to determine the scale of the problem .
he said the impact on ordinary passengers is ` unacceptable ' , adding : ` we are in danger of saying those types of experiences are ok that