I've always though you become invincible if you've just left a football stadium? If cars stop to let me cross then so do trains!
. Wouldn't worry too much there's plenty of time to clear the tracks, if its the incoming Train from Sheffield the barriers must come down when the train leaves Meadowhall, or at least it seems that way.
Thankfully the Millwall lot where more bothered about fighting the police, otherwise 30 odd south London meat heads would have been steaming into the Barnsley fans