/* The tile owner of LOCK_PART_LOWER and LOCK_PART_UPPER was either
			 * the owner of the water or the owner of the lock. The tile owner of 
			 * LOCK_PART_MIDDLE was the real owner of the lock. */
			if (IsTileType(t, MP_WATER) && IsLock(t)) {
				if (GetWaterClass(t) == WATER_CLASS_CANAL) {
					/* First, set the canal owner for every lock part to be the same as the tile owner. */
					SetCanalOwner(t, GetTileOwner(t));
				}
				/* Then, set the tile owner of LOCK_PART_LOWER and LOCK_PART_UPPER to be the same 
				 * as the owner of the LOCK_PART_MIDDLE. */
				static const TileIndexDiffC _lock_tomiddle_offs[][DIAGDIR_END] = {
					/*   NE       SE        SW      NW       */
					{ { 0,  0}, {0,  0}, { 0, 0}, {0,  0} }, // LOCK_PART_MIDDLE
					{ {-1,  0}, {0,  1}, { 1, 0}, {0, -1} }, // LOCK_PART_LOWER
					{ { 1,  0}, {0, -1}, {-1, 0}, {0,  1} }, // LOCK_PART_UPPER
				};
				if (GetLockPart(t) != LOCK_PART_MIDDLE) {
					SetTileOwner(t, GetTileOwner(t + ToTileIndexDiff(_lock_tomiddle_offs[GetLockPart(t)][GetLockDirection(t)])));
				}
			}