Uncoupler track

What is checked? Whether a plan with a shunting area has an uncoupling track anywhere. A shunting area is a stub track on the diverging side of a turnout — a spur or siding where cars are set out or picked up.

Why does it matter? Shunting means leaving single cars at a specific spot. Without an uncoupling track, the only way is by hand — or the car rides along again. This is easy to miss while planning, because the track plan looks just as finished without an uncoupler; it shows up in the first operating session, when the track is already laid.

How to fix it: Put an uncoupling track in the shunting area, usually a little before the end of the spur so the locomotive can get out again after uncoupling. In the Tracks tool search the catalogue for “Entkupplungsgleis” (the part names come from the German catalogue) and swap it in for a straight piece. If your track system has no uncoupling track of its own, under-track uncouplers (magnet or ramp) are available — the plan check does not know them; in that case hide the hint.

Numbers & defaults: Hint level, no threshold. One hint per plan — one uncoupling track anywhere is enough; exactly where is detail planning. A stub on the stem of a turnout (the approach, a tail track) does not count as a shunting area, nor do wye turnouts and crossings without a clear stem.