To my best recollection: Years ago, the "wait for trigger" got considerable attention at the forums. It was working fine and after an upgrade, it ceased to do. Then, someone came with a solution in the name of a different asset. I tried and it did the same thing. So, after more fiddling, I found a workaround using other means. And these ultimately do almost the same thing, albeit with more elaborate methods. Picture this:
A train arrives to the docks, unloads passengers and a vessel departs. You would have a trigger on the train track that will activate the wait for trigger so the vessel carries the schedule assigned. Simple enough. But if it does not work, you have to edit the rules and command menus to make it to perform. Do this:
Open surveyor of your route. Go to edit session rules. Have a "trigger check" rule available. Add a child rule called "Drive schedule rule". A child rule is indented just below the "Trigger check". On this rule select the name of the trigger that will activate the vessel. On the child rule, you select the name of the vessel and you should have a schedule already created for this vessel to go somewhere. And presto! the train arrives to the trigger, it activates the child rule and the vessel departs. It takes longer to explain than it is to set up.
Use common sense. I do this to start ships, airplanes and other trains. Also to set paths, signals and turnouts. It all works. Yes "Wait for trigger" would be easier, but we must make our best considering the situations.
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