Superintendent asked to rule on X15 against X18, which was behind it; X18 then destroyed, X15 unharmed #26

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2026-09-15T22:12:38Z

Jesse.Markowitz commented

2026-09-15 22:12:38 +00:00

Reported from multiplayer playtesting (v0.8.0.9). Two westbound Extras: X15 further west on the Mainline cards than X18. The Superintendent was still asked to rule — "Train X15 wants to enter the Mainline card that Train X18 is still crossing" — though X15 should be ahead of X18, not behind it. X15 was held; a collision followed, destroying X18 while X15 was fine.

Save exported for replay (kept out of the repo: it contains player names).

Leads from the code, not yet confirmed against the save:

evaluateClearance asks the Superintendent about ANY same-direction occupant anywhere in the target Subdivision, without checking whether that train is ahead of or behind the one departing.
An Extra pulling out of an Interchange yard enters at the BACK of the card (Gitea#3), which could put X18 genuinely ahead on that card even if the map drew X15 further west.
A catching-up collision removes BOTH trains (collide(..., [id, ahead.tray])), so one destroyed and one unharmed does not match that path either, and needs explaining.

Reported from multiplayer playtesting (v0.8.0.9). Two westbound Extras: X15 further west on the Mainline cards than X18. The Superintendent was still asked to rule — "Train X15 wants to enter the Mainline card that Train X18 is still crossing" — though X15 should be ahead of X18, not behind it. X15 was held; a collision followed, destroying X18 while X15 was fine. Save exported for replay (kept out of the repo: it contains player names). **Leads from the code, not yet confirmed against the save:** - `evaluateClearance` asks the Superintendent about ANY same-direction occupant anywhere in the target Subdivision, without checking whether that train is ahead of or behind the one departing. - An Extra pulling out of an Interchange yard enters at the BACK of the card (Gitea#3), which could put X18 genuinely ahead on that card even if the map drew X15 further west. - A catching-up collision removes BOTH trains (`collide(..., [id, ahead.tray])`), so one destroyed and one unharmed does not match that path either, and needs explaining.

Jesse.Markowitz referenced this issue from a commit

2026-09-16 02:44:24 +00:00

v0.8.0.10 — playtest fixes: clearance rulings, the log, the map, and a save file

Jesse.Markowitz closed this issue

2026-09-16 02:44:25 +00:00

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Reference: Jesse.Markowitz/station-master#26