--- a/src/engine.h	Thu Feb 21 16:05:33 2008 +0000
+++ b/src/engine.h	Thu Feb 21 19:09:10 2008 +0000
@@ -90,6 +90,7 @@
 	byte image_index;
 	byte base_cost;
 	byte running_cost;
+	byte running_cost_class;
 	SoundFxByte sfx;
 	byte max_speed;
 	byte capacity;