--- a/newgrf.c	Sun May 29 16:06:21 2005 +0000
+++ b/newgrf.c	Sun May 29 20:05:04 2005 +0000
@@ -348,6 +348,7 @@
 		case 0x1C:	/* Refit cost */
 		case 0x1E:	/* Callback */
 		case 0x1F:	/* Tractive effort */
+		case 0x20:	/* Air drag */
 		case 0x21:	/* Shorter tenders */
 		case 0x22:	/* Visual */
 		case 0x23: {/* Powered wagons weight bonus */