Occasionally I'd get jams. The jams would manifest with a train sat occupying the corner, so i put a circuit in each one that sets off an alarm after 60 seconds of being continuously blocked. Then I'd investigate.

Generally, given that my stations only became available if they had > 1.0wagonscapacity*stacksize the trains mostly sat in "parking" waiting or at "parking" nearer the raw resource in the far outposts.

It required a little tuning, some modules have a lead-in perimeter loop where 5-6 trains can be stacked waiting to unload.