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March 20, 2015 at 00:27
#18023
isidoro
Participant
That is because path finding is more o less static, I guess. Once it is calculated for a line, it is fixed unless something happens (track modifications). A more dynamic approach could calculate alternatives when the main option is occupied. But that is also complicated, since it could lead to some trains taking weird alternatives just because the main path is occupied. To prevent such a case, the search for an alternative should be limited in space, by means of marking the zone where to search with a special type of signal… Not that easy…