KR electrification may take a few years but you are right, yours is a futuristic train, so it is okay. It may be casual to have crossings on single lines, but the point is that the speed of the train gets reduced if there are more crossings. So you have to look at the number of crossings before the speed is decided. Anyway, it is your imaginary train, you are the one in control, so you can do exactly as you want. Please ignore the feedback/suggestions if you so wish