So I've got a manifold of train stations--one line comes in, branches into like six parallel train stations, and then they rejoin into one line. Each station has a block signal at each end, so the one-into-many section and the many-into-one section are blocks.

Sometimes, when there's enough traffic that more than train is finished unloading and ready to take off, when the many-to-one block frees up, two trains will enter the block simultaneously and collide.

Anyone know what to do about that?