Posted September 08, 2021
A short video of the merging track finally working without any problems :
https://imgur.com/a/ppyUUVO
Every now and again I'd come back to the merging track and see it had backed up, and I finally discovered the culprit: when the merging is done after a 90 degree turn, then naturally the two sides reaches their turns at different speeds. This causes different slowdowns for the two sides, and slightly affects the time it takes for the two to reach the final merging junction. So all that was needed to was to put down two waypoints, with a speed limit in between corresponding to the max speed of the turn in tracks, and to make sure that the 2nd waypoint is far enough along the track so that both trains have the same acceleration beyond it.
https://imgur.com/a/ppyUUVO
Every now and again I'd come back to the merging track and see it had backed up, and I finally discovered the culprit: when the merging is done after a 90 degree turn, then naturally the two sides reaches their turns at different speeds. This causes different slowdowns for the two sides, and slightly affects the time it takes for the two to reach the final merging junction. So all that was needed to was to put down two waypoints, with a speed limit in between corresponding to the max speed of the turn in tracks, and to make sure that the 2nd waypoint is far enough along the track so that both trains have the same acceleration beyond it.