![]() The first stage load balanced trains between two sets of waiting lanes in the second stage. ![]() The waiting lanes' exits use priorities so that the merging train can only enter the mainline if there is a sufficiently large gap, so that trains on the mainline never have to slow down.įor a 4-track mainline, you do the same, but with two stages of waiting lanes. The waiting lanes' entries are load balanced with presignals, so that any incoming train will pick whichever waiting lane is free, and if both are occupied, then the next incoming train will wait before the split. The basic recipe for a two-track mainline is to have two waiting lanes for the merging track, each of them exactly long enough to hold one train.
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