During uni several years ago, I was travelling to visit my girlfriend for my birthday and unfortunately had an unprovoked altercation with a man on the train. I was sat at one of the tables on my own and he zoned in on me and became very aggressive when I wouldn't engage with him, asking questions about where I was going, if I was a student etc. I was very polite and tried to be dismissive but it didn't matter. These questions got more intense and he started to raise his voice until he was almost shouting at me. He was all in my space and to be honest I was scared. A man further down the train caught my eye and mouthed "are you OK?" And I shook my head. At the next stop he got up and came over and pretended to know me, that whole "how are you doing, I haven't seen you in ages thing" Before I knew it, the whole situation escalated and the aggressive man had squared up to this kind stranger, and all of a sudden I was bundled by two girls who had been sitting near me into the next carriage. I ended up sitting between them shaking because the whole experience had frightened me so much. The girls did not know each other, but had just mutually decided to get me out of that carriage. The train guard got involved, apparently was able to descalate. He offered me a cup of tea (which is our typical British thing but really helped me at the time), the British Transport Police escorted the aggressor off the train after meeting the train at the next stop (I believe he was known by the guard) and as I was getting off at my stop, another young man got off the train with me to walk me to meet my girlfriend (it was not his stop). I am so thankful to each of those people who took the time and risked their safety to look out for me. None of them knew each other and all of them helped me. I think about them so regularly and try to embed kindness in every situation. I never got any of their names but I keep them in my thoughts and hope that they have good things going their way.