--- a/src/rail_cmd.cpp	Sun May 06 21:10:49 2007 +0000
+++ b/src/rail_cmd.cpp	Mon May 07 11:24:23 2007 +0000
@@ -1322,7 +1322,7 @@
 
 		DrawTrackBits(ti, rails);
 
-		if (_display_opt & DO_FULL_DETAIL) DrawTrackDetails(ti);
+		if (HASBIT(_display_opt, DO_FULL_DETAIL)) DrawTrackDetails(ti);
 
 		if (HasSignals(ti->tile)) DrawSignals(ti->tile, rails);
 	} else {