I am the same with the trains here; mostly I don't notice them. The occasional train does blow its whistle when it goes past -- there are some trains that don't stop at my little station, most notably the Belfast to Dublin trains -- and that I do usually hear no matter where in the house I am or if the windows/doors are open. The 'normal' trains, I usually have to keep an ear out for to notice. They have never disturbed me, especially at night. But then my bedroom window faces away from the train line, and when I lived in London my bedroom looked out across a busy main road towards a hospital with an Accidents and Emergency departments. So ambulances would come past with their sirens on, and even that didn't disturb my sleep. I could usually tune all the traffic noises out to the point where I didn't notice them, except on those days that were so warm that I opened the windows on both sides of the flat to try to cool it down.