user card Hand becomes the action surface, the board shows the train, and a reverse stops turning it around, other bug fixes too.

src/engine/apply.ts

@@ -719,7 +719,20 @@ function execute(s: GameState, player: PlayerIndex, i: Intent): GameEvent[] {
           from,
           to: i.to,
           movesRemaining: s.turn.movesRemaining - 1,
-          facing: opposite(dest.entry),
+          /**
+           * A TRAIN THAT BACKS UP HAS NOT TURNED AROUND.
+           *
+           * `facing` is which way the ENGINE points, and this set it to the direction of travel on
+           * every move — so one reverse move silently spun the train about. Everything then read
+           * "forward" again, and a run-around became pointless: you could change ends for free by
+           * backing up twice.
+           *
+           * Running forward the engine leads, so it points the way the train went: `opposite(entry)`.
+           * Backing up it trails, still pointing the way it came, which is the port it arrived
+           * through. Both hold around a curve, where the compass heading changes but the engine's
+           * relationship to its train does not.
+           */
+          facing: i.reverse ? dest.entry : opposite(dest.entry),
         },
       ];
       if (dest.couples.length > 0) {