Merge branch 'master' into jgrpp

src/elrail.cpp

@@ -155,6 +155,7 @@ static DualTrackBits GetRailTrackBitsUniversal(TileIndex t, byte *override)
  */
 static TrackBits MaskWireBits(TileIndex t, TrackBits tracks)
 {
+	/* Single track bits are never masked out. */
 	if (likely(HasAtMostOneBit(tracks))) return tracks;
 
 	if (!IsPlainRailTile(t)) return tracks;