--- a/industry_cmd.c	Fri Jul 15 09:01:23 2005 +0000
+++ b/industry_cmd.c	Fri Jul 15 12:16:16 2005 +0000
@@ -821,8 +821,7 @@
 			Industry *i = GetIndustry(_m[tile].m2);
 			if (i->was_cargo_delivered) {
 				i->was_cargo_delivered = false;
-				if ((_m[tile].m4|_m[tile].m3) != 0)
-					_m[tile].m4 = 0;
+				_m[tile].m4 = 0;
 				AddAnimatedTile(tile);
 			}
 		}

--- a/town_cmd.c	Fri Jul 15 09:01:23 2005 +0000
+++ b/town_cmd.c	Fri Jul 15 12:16:16 2005 +0000
@@ -159,8 +159,7 @@
 	if (_tick_counter & 3)
 		return;
 
-	if (_m[tile].m4 != 4 && _m[tile].m4 != 5)
-		return;
+	assert(_m[tile].m4 == 4 || _m[tile].m4 == 5);
 
 	if (!((old=_m[tile].owner)&0x80)) {
 		_m[tile].owner |= 0x80;