The last time I encountered some of them on a train they were on a XC train from Donny to somewhere like Leamington or Banbury and were basically 'effing it', and one of them tried to pinch someone's bag. Their accents confused me, but then someone identified them as travellers. That 'someone' announced that just been out of prison and had family members who were travellers and told them that if the guard tried to evict them he'd use violence against him. The guard then checked other peoples' tickets and told other people off for being invalid, while doing nothing about them for fear of violence. When a woman complained that someone was crawling under her seat, a woman sat near her tried to drown her voice out by talking gibberish, but that trick didn't work. BTP were nowhere to be seen where I got off at Derby so have no idea what happened next.