diff -r c17046b1b8a2 -r 760b7b504e37 src/ai/api/ai_stationlist_valuator.hpp
--- a/src/ai/api/ai_stationlist_valuator.hpp	Fri Jul 13 11:04:00 2007 +0000
+++ b/src/ai/api/ai_stationlist_valuator.hpp	Fri Jul 13 13:49:39 2007 +0000
@@ -46,4 +46,27 @@
 	int32 Valuate(int32 station) const;
 };
 
+/**
+ * Get the cargo rating for entries in an AIStationList instance.
+ * @note resulting items are of the type percent
+ * @note the input items are of the type StationID
+ */
+class AIStationListCargoRating : public AIAbstractList::Valuator {
+public:
+	/**
+	 * The name of the class, needed by several sub-processes.
+	 */
+	static const char *GetClassName() { return "AIStationListCargoRating"; }
+
+	/**
+	 * Custom constructor, we want a cargo-type as parameter.
+	 */
+	AIStationListCargoRating(CargoID cargo_type) { this->cargo_type = cargo_type; }
+
+private:
+	CargoID cargo_type;
+
+	int32 Valuate(int32 station) const;
+};
+
 #endif /* AI_STATIONLIST_VALUATOR_HPP */