--- a/engine.h	Sat Nov 05 14:01:00 2005 +0000
+++ b/engine.h	Sat Nov 05 16:07:26 2005 +0000
@@ -153,6 +153,8 @@
 	// Refit capacity, the passed vehicle needs to have its ->cargo_type set to
 	// the cargo we are refitting to, returns the new cargo capacity
 	CBID_REFIT_CAP = 0x15,
+
+	CBID_ARTIC_ENGINE = 0x16,
 };
 
 // bit positions for rvi->callbackmask, indicates which callbacks are used by an engine
@@ -161,6 +163,7 @@
 	CBM_WAGON_POWER = 0,
 	CBM_VEH_LENGTH = 1,
 	CBM_REFIT_CAP = 3,
+	CBM_ARTIC_ENGINE = 4,
 };
 
 enum {