adding classification and division yard updates, train collisions, engine and car updates, turnout improvements.

test/track.test.ts

@@ -545,7 +545,7 @@ describe('coupling lifts only the cars the crew ran over', () => {
     const area = areaFrom(grid, { row: 0, col: 0 });
     const s = gameWith(area);
     s.trays.set('crew', {
-      id: 'crew', trainNumber: 1, trainIsExtra: false, engineFront: true, consist: [],
+      id: 'crew', trainNumber: 1, trainIsExtra: false, engineAt: 0, consist: [],
       direction: 'west', facing: 'w', position: { at: 'grid', owner: 0, coord: { row: 0, col: 0 } }, movesUsed: 0,
     });
     s.clock.phase = 'localOps';