Track becomes a deck card, Departments become decks, and trains must be made up to leave, industry restrictions enforced, update display and add a new game button

docs/rules/open-questions.md

@@ -245,9 +245,15 @@ is an explicit mechanic that can't be tuned without a number.
 
 1. **The Home Office deck is a single deck containing every card type.** §4.5–4.6 shuffles one deck,
    deals three cards to each player, then turns three cards face-up beside it as the Department
-   decks. §6.2's reshuffle sweeps the Salvage Yard *and* all three Department decks back into it. The
-   Departments are therefore three face-up market slots fed from the one deck, not decks with their
-   own contents.
+   decks. §6.2's reshuffle sweeps the Salvage Yard *and* all three Department decks back into it.
+
+   > **CORRECTED.** This finding went on to conclude the Departments were "three face-up market
+   > slots fed from the one deck, not decks with their own contents". They are **decks**: shared by
+   > every player, discarded onto and drawn from. §6.2 says a discard goes "face up ON TOP of one of
+   > the three Department slots" and a draw takes "the TOP face-up card" — both phrases only mean
+   > something over a pile. Modelling them as one-card slots made a discard OVERWRITE whatever was
+   > face up there, destroying a card from a closed deck, and removed the strategy in choosing which
+   > Department to use.
 2. **A player's Office area is a card grid, not a row.** §9 permits a Modifier "adjacent (on any of
    the nine nearby spots)" — a 3×3 neighbourhood. Appendix A's diagrams show a 2×3 grid: bottom row
    D/E/F is the Running Track with the Depot as Office at E, top row A/B/C is Secondary Track with a