diff -r 18cc31fe97a8 -r a23183d868d1 engine.c
--- a/engine.c	Sat Oct 07 13:58:08 2006 +0000
+++ b/engine.c	Sat Oct 07 14:30:13 2006 +0000
@@ -209,8 +209,11 @@
 	SETBIT(p->avail_railtypes, e->railtype);
 
 	e->preview_player = 0xFF;
-	InvalidateWindowClasses(WC_BUILD_VEHICLE);
-	InvalidateWindowClasses(WC_REPLACE_VEHICLE);
+	if (player == _local_player) {
+		InvalidateWindowClassesData(WC_BUILD_VEHICLE);
+		InvalidateWindowClasses(WC_BUILD_VEHICLE);
+		InvalidateWindowClasses(WC_REPLACE_VEHICLE);
+	}
 }
 
 static PlayerID GetBestPlayer(PlayerID pp)
@@ -332,6 +335,7 @@
 	}
 
 	e->flags = (e->flags & ~ENGINE_INTRODUCING) | ENGINE_AVAILABLE;
+	InvalidateWindowClassesData(WC_BUILD_VEHICLE);
 	InvalidateWindowClasses(WC_BUILD_VEHICLE);
 	InvalidateWindowClasses(WC_REPLACE_VEHICLE);