Pulling my hairs out trying to do seamless high speed merging: 3 high volume lanes, and I want the middle one to merge into either of the two outside ones, so that I can reduce it to 2 very high volume lanes.
- Tried a timing circuit of sorts to alternate the output from the outside lanes, so that it never happens that two trains enter the outside lanes at the same time. This way there should always be room to merge. This could perhaps still be made to work, but it's going to require a more intricate/clever approach.
- Merging track, where if the middle lane cannot merge, it continues straight ahead and slows down a bit before trying again. The problem here is that it slows down too much by the time it actually merges (261kph down to 200 kph), which causes a slow down 'ripple' in the lane. It seems that merging will have to be done at full speed or not at all. Unfortunately this means the trains can't use slowing down as a way to find a merging spot. They will have to slow down by going on tracks with longer full speed bends instead. But this will require much more space.
There's going to have to be a central maintenance track of sorts, for all trains who fail to merge regardless, so that they can limp to the final station, and only rejoin the track at a later flow regulator.