(svn r19814) -Codechange: give some more unnamed enums a name, in case they consisted of unrelated values use static const (u)int

src/rail_cmd.cpp

@@ -2129,7 +2129,7 @@ static void DrawTrackBits(TileInfo *ti, TrackBits track)
  * The addtion of 2 per enum is necessary in order to "jump" over the
  * green state sprite, all signal sprites being in pair,
  * starting with the off-red state */
-enum {
+enum SignalOffsets {
 	SIGNAL_TO_SOUTHWEST =  0,
 	SIGNAL_TO_NORTHEAST =  2,
 	SIGNAL_TO_SOUTHEAST =  4,