Doing a form of martial art would certainly help.
An old training partner of mine took on 5 kids armed with knives trying to rob him of his phone, yes he got some injuries to him, but he also beat ten bells out of 2 of them which stopped them attacking and stopped them from robbing his stuff.
Even just having 2 people trained in an effective martial art (effective being key word here), they would have been able to deal with the POS, yes they could have injured themselves, but they would have stood a better chance than the railway staff at resolving the issue and stopping people being injured.