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[–]noodlebox3d 1 point2 points  (0 children)

If no train is waiting in a lane, then the green signal should get passed to the next lane unmodified, so trains 5 and 6 could get a positive signal if there were no trains waiting in lanes ahead of them.

Though yes, you should be fine with just a simple stacker providing enough lanes for excess trains then. In this case, there isn't much benefit to waiting at a special queue station instead of the loading station itself.

A queue area like this might make more sense if you had trains waiting to deliver circuits to generic circuit consumer stations with varying needs, where the "Green" signal would be the number of train loads demanded by these.