So after careful analysis and watching multiple youtube videos I've come to the following conclusion - switch track with a spike. I don't think an LSM can clear 400ft in a single launch so it would require multiple launches. I just saw a video that says it would take a minute to do this (I saw this on youtube so it must be true) which is reasonable. If you have a switch track, you can load passengers while one of the trains are launched. This also allows multiple trains so you can launch one after another. This would also allow longer trains. The only problem is that there isn't enough room in the station for a switch track but chances are they'll have to move the station anyway. Could be the removed track is the start of the spike. Feel free to ridicule me endlessly if I'm wrong. Not sure if gambling is allowed on this site.