This will highly depend on the ordering of the trains.
This i a design choice and there would be other solutions to this problem. In the case of flatland, trains can drive behind each other as long as the index of the train in front is lower than the index of the train behind it. For example.
Train 2 can follow train 1 directly. But train 1 CANNOT follow train 2 directly.
Does this help?
Which log are you refereing to? I’m happy to take a look at it.
Best regards
Erik