I want to ask, how was the train coming to the camera in the movie taken?

I have studied this problem with the cast before. It is very difficult to shoot directly when the train comes, but there is a clever way to avoid it, that is, put the lens aside, put a mirror at the 45-degree angle of the track, and aim the lens at the camera to shoot, so that the train will come to your camera. It only needs a mirror, which is very real.