+       /* In diagonal crossings patch, level crossings were changed to store the rail
+        * direction, to allow for diagonal level crossings. We need to add the
+        * rail direction to all existing level crossings. */
+       if (IsSavegameVersionBefore(SLV_DIAG_CROSSINGS)) {
+               for (TileIndex t = 0; t < map_size; t++) {
+                       if (IsLevelCrossingTile(t)) {
+                               Axis road = GetCrossingRoadAxis(t);
+                               Track track = (road == AXIS_Y) ? TRACK_X : TRACK_Y;
+                               _m[t].m5 &= 0xF1;
+                               _m[t].m5 |= track << 1;
+                       }
+               }
+       }
+