It was just something that I tried to see what would happen. My main track is like 250+ miles long. I put 7 to 10 identical trains on each track. Then, I started one on each track and set speed to 50%. A little later I would start another, again at 50%. That way, they never caught up to each other. Also, there were MANY other 3-8 tracks operating, again with numerous identical trains on each track. It was kinda neat watching them all going at once.