diff --git a/src/ai/ai_storage.hpp b/src/ai/ai_storage.hpp
new file mode 100644
--- /dev/null
+++ b/src/ai/ai_storage.hpp
@@ -0,0 +1,78 @@
+/* $Id$ */
+
+/** @file ai_storage.hpp Defines AIStorage and includes all files required for it. */
+
+#ifndef AI_STORAGE_HPP
+#define AI_STORAGE_HPP
+
+#include "../command_func.h"
+#include "../map_func.h"
+#include "../network/network.h"
+#include "../company_func.h"
+#include "../signs_func.h"
+#include "../tunnelbridge.h"
+#include "../vehicle_func.h"
+#include "../group.h"
+
+#include <vector>
+
+/**
+ * The callback function for Mode-classes.
+ */
+typedef bool (AIModeProc)(TileIndex tile, uint32 p1, uint32 p2, uint procc, CommandCost costs);
+
+/**
+ * The storage for each AI. It keeps track of important information.
+ */
+class AIStorage {
+friend class AIObject;
+private:
+	AIModeProc *mode;                //!< The current build mode we are int.
+	class AIObject *mode_instance;   //!< The instance belonging to the current build mode.
+
+	uint delay;                      //!< The ticks of delay each DoCommand has.
+	bool allow_do_command;           //!< Is the usage of DoCommands restricted?
+
+	CommandCost costs;               //!< The costs the AI is tracking.
+	Money last_cost;                 //!< The last cost of the command.
+	uint last_error;                 //!< The last error of the command.
+	bool last_command_res;           //!< The last result of the command.
+
+	VehicleID new_vehicle_id;        //!< The ID of the new Vehicle.
+	SignID new_sign_id;              //!< The ID of the new Sign.
+	TileIndex new_tunnel_endtile;    //!< The TileIndex of the new Tunnel.
+	GroupID new_group_id;            //!< The ID of the new Group.
+
+	std::vector<int> callback_value; //!< The values which need to survive a callback.
+
+	RoadType road_type;              //!< The current roadtype we build.
+	RailType rail_type;              //!< The current railtype we build.
+
+	void *event_data;                //!< Pointer to the event data storage.
+	void *log_data;                  //!< Pointer to the log data storage.
+
+public:
+	AIStorage() :
+		mode              (NULL),
+		mode_instance     (NULL),
+		delay             (1),
+		allow_do_command  (true),
+		/* costs (can't be set) */
+		last_cost         (0),
+		last_error        (STR_NULL),
+		last_command_res  (true),
+		new_vehicle_id    (0),
+		new_sign_id       (0),
+		new_tunnel_endtile(INVALID_TILE),
+		new_group_id      (0),
+		/* calback_value (can't be set) */
+		road_type         (INVALID_ROADTYPE),
+		rail_type         (INVALID_RAILTYPE),
+		event_data        (NULL),
+		log_data          (NULL)
+	{ }
+
+	~AIStorage();
+};
+
+#endif /* AI_STORAGE_HPP */