--- a/src/industry.h	Sat Sep 22 21:59:02 2007 +0000
+++ b/src/industry.h	Sat Sep 22 23:14:32 2007 +0000
@@ -82,6 +82,10 @@
 	INDUSTRYBEH_AIRPLANE_ATTACKS      = 1 << 11, ///< can be exploded by a military airplane (oil refinery)
 	INDUSTRYBEH_CHOPPER_ATTACKS       = 1 << 12, ///< can be exploded by a military helicopter (factory)
 	INDUSTRYBEH_CAN_SUBSIDENCE        = 1 << 13, ///< can cause a subsidence (coal mine, shaft that collapses)
+	/* The following flags are only used for newindustries and do no represent any normal behaviour */
+	INDUSTRYBEH_PROD_MULTI_HNDLING    = 1 << 14, ///< Automatic production multiplier handling
+	INDUSTRYBEH_PRODCALLBACK_RANDOM   = 1 << 15, ///< Production callback needs random bits in var 10
+	INDUSTRYBEH_NOBUILT_MAPCREATION   = 1 << 16, ///< Do not force one instance of this type to appear on map generation
 	INDUSTRYBEH_CANCLOSE_LASTINSTANCE = 1 << 17, ///< Allow closing down the last instance of this type
 };
 

--- a/src/newgrf_industries.cpp	Sat Sep 22 21:59:02 2007 +0000
+++ b/src/newgrf_industries.cpp	Sat Sep 22 23:14:32 2007 +0000
@@ -462,13 +462,15 @@
  */
 void IndustryProductionCallback(Industry *ind, int reason)
 {
+	const IndustrySpec *spec = GetIndustrySpec(ind->type);
 	ResolverObject object;
 	NewIndustryResolver(&object, ind->xy, ind);
+	if ((spec->behaviour & INDUSTRYBEH_PRODCALLBACK_RANDOM) != 0) object.callback_param1 = Random();
 	object.callback_param2 = reason;
 
 	for (uint loop = 0;; loop++) {
 		SB(object.callback_param2, 8, 16, loop);
-		const SpriteGroup *group = Resolve(GetIndustrySpec(ind->type)->grf_prop.spritegroup, &object);
+		const SpriteGroup *group = Resolve(spec->grf_prop.spritegroup, &object);
 		if (group == NULL || group->type != SGT_INDUSTRY_PRODUCTION) break;
 
 		bool deref = (group->g.indprod.version == 1);