My fear is of trains, train stations, railway lines and railway crossings. I have to stand on the platform with my back to a wall miles from the platform edge. I can't leave that spot until the train is in the station. Once on the train I'm Ok but getting off is a trauma too.
If people are walking along the platform close to the edge or (as I have seen on several occasions) using bicycles, scooters or skateboards on the platform, I practically have a panic attack.
When we have to approach and pass over a railway crossing (loads and loads of them out in the country round here) I get a big fear rush and the family think it is hysterically funny.