(svn r27207) -Codechange: Replace some magic integers with the appropiate symbols.

src/rail_cmd.cpp

@@ -2059,16 +2059,16 @@ static void DrawTrackBitsOverlay(TileInfo *ti, TrackBits track, const RailtypeIn
 		/* Half-tile foundation, no track here? */
 	} else if (ti->tileh == SLOPE_NW && track == TRACK_BIT_Y) {
 		DrawGroundSprite(ground + RTO_SLOPE_NW, PAL_NONE);
-		if (pbs != TRACK_BIT_NONE) DrawGroundSprite(overlay + 9, PALETTE_CRASH);
+		if (pbs != TRACK_BIT_NONE) DrawGroundSprite(overlay + RTO_SLOPE_NW, PALETTE_CRASH);
 	} else if (ti->tileh == SLOPE_NE && track == TRACK_BIT_X) {
 		DrawGroundSprite(ground + RTO_SLOPE_NE, PAL_NONE);
-		if (pbs != TRACK_BIT_NONE) DrawGroundSprite(overlay + 6, PALETTE_CRASH);
+		if (pbs != TRACK_BIT_NONE) DrawGroundSprite(overlay + RTO_SLOPE_NE, PALETTE_CRASH);
 	} else if (ti->tileh == SLOPE_SE && track == TRACK_BIT_Y) {
 		DrawGroundSprite(ground + RTO_SLOPE_SE, PAL_NONE);
-		if (pbs != TRACK_BIT_NONE) DrawGroundSprite(overlay + 7, PALETTE_CRASH);
+		if (pbs != TRACK_BIT_NONE) DrawGroundSprite(overlay + RTO_SLOPE_SE, PALETTE_CRASH);
 	} else if (ti->tileh == SLOPE_SW && track == TRACK_BIT_X) {
 		DrawGroundSprite(ground + RTO_SLOPE_SW, PAL_NONE);
-		if (pbs != TRACK_BIT_NONE) DrawGroundSprite(overlay + 8, PALETTE_CRASH);
+		if (pbs != TRACK_BIT_NONE) DrawGroundSprite(overlay + RTO_SLOPE_SW, PALETTE_CRASH);
 	} else {
 		switch (track) {
 			/* Draw single ground sprite when not overlapping. No track overlay