@d4v @Rastal @MarkHoltom

I live in UK too, not every station or transport hub has ticket operated barriers.

You may get drug users or homeless people on the trains or hanging around stations, but its extremely rare for them to target strangers in any way.

People can take all sorts of drugs and not be obvious (and its far better if they do that and use train/bus than driving!)

There are safety risks on UK transport but its more from angry men looking for somebody to harass (maybe for gender/skin colour/sexuality, or that they are in the public eye).

Which might also be why Sir Paul McCartney picked an empty part of the carriage where many (especially younger people) might think he is just any other middle aged man..