diff --git a/src/ai/api/ai_object.hpp b/src/ai/api/ai_object.hpp
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+++ b/src/ai/api/ai_object.hpp
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+/* $Id$ */
+
+/** @file ai_object.hpp Main object, on which all objects depend. */
+
+#ifndef AI_OBJECT_HPP
+#define AI_OBJECT_HPP
+
+#include "../../stdafx.h"
+#include "../../misc/countedptr.hpp"
+#include "../../road_type.h"
+#include "../../rail_type.h"
+
+#include "ai_types.hpp"
+
+/**
+ * The callback function when an AI suspends.
+ */
+typedef void (AISuspendCallbackProc)(class AIInstance *instance);
+
+/**
+ * The callback function for Mode-classes.
+ */
+typedef bool (AIModeProc)(TileIndex tile, uint32 p1, uint32 p2, uint cmd, CommandCost costs);
+
+/**
+ * Uper-parent object of all API classes. You should never use this class in
+ *   your AI, as it doesn't publish any public functions. It is used
+ *   internally to have a common place to handle general things, like internal
+ *   command processing, and command-validation checks.
+ */
+class AIObject : public SimpleCountedObject {
+friend void CcAI(bool success, TileIndex tile, uint32 p1, uint32 p2);
+friend class AIInstance;
+friend class AIController;
+protected:
+	/**
+	 * Executes a raw DoCommand for the AI.
+	 */
+	static bool DoCommand(TileIndex tile, uint32 p1, uint32 p2, uint cmd, const char *text = NULL, AISuspendCallbackProc *callback = NULL);
+
+	/**
+	 * Sets the DoCommand costs counter to a value.
+	 */
+	static void SetDoCommandCosts(Money value);
+
+	/**
+	 * Increase the current value of the DoCommand costs counter.
+	 */
+	static void IncreaseDoCommandCosts(Money value);
+
+	/**
+	 * Get the current DoCommand costs counter.
+	 */
+	static Money GetDoCommandCosts();
+
+	/**
+	 * Set the DoCommand last error.
+	 */
+	static void SetLastError(AIErrorType last_error);
+
+	/**
+	 * Get the DoCommand last error.
+	 */
+	static AIErrorType GetLastError();
+
+	/**
+	 * Set the road type.
+	 */
+	static void SetRoadType(RoadType road_type);
+
+	/**
+	 * Get the road type.
+	 */
+	static RoadType GetRoadType();
+
+	/**
+	 * Set the rail type.
+	 */
+	static void SetRailType(RailType rail_type);
+
+	/**
+	 * Get the rail type.
+	 */
+	static RailType GetRailType();
+
+	/**
+	 * Set the current mode of your AI to this proc.
+	 */
+	static void SetDoCommandMode(AIModeProc *proc, AIObject *instance);
+
+	/**
+	 * Get the current mode your AI is currently under.
+	 */
+	static AIModeProc *GetDoCommandMode();
+
+	/**
+	 * Get the instance of the current mode your AI is currently under.
+	 */
+	static AIObject *GetDoCommandModeInstance();
+
+	/**
+	 * Set the delay of the DoCommand.
+	 */
+	static void SetDoCommandDelay(uint ticks);
+
+	/**
+	 * Get the delay of the DoCommand.
+	 */
+	static uint GetDoCommandDelay();
+
+	/**
+	 * Get the latest result of a DoCommand.
+	 */
+	static bool GetLastCommandRes();
+
+	/**
+	 * Get the latest stored new_vehicle_id.
+	 */
+	static VehicleID GetNewVehicleID();
+
+	/**
+	 * Get the latest stored new_sign_id.
+	 */
+	static SignID GetNewSignID();
+
+	/**
+	 * Get the latest stored new_tunnel_endtile.
+	 */
+	static TileIndex GetNewTunnelEndtile();
+
+	/**
+	 * Get the latest stored new_group_id.
+	 */
+	static GroupID GetNewGroupID();
+
+	/**
+	 * Get the latest stored allow_do_command.
+	 *  If this is false, you are not allowed to do any DoCommands.
+	 */
+	static bool GetAllowDoCommand();
+
+	/**
+	 * Get the pointer to store event data in.
+	 */
+	static void *&GetEventPointer();
+
+	static void SetLastCost(Money last_cost);
+	static Money GetLastCost();
+	static void SetCallbackVariable(int index, int value);
+	static int GetCallbackVariable(int index);
+
+public:
+	/**
+	 * Store the latest result of a DoCommand per company.
+	 * @note NEVER use this yourself in your AI!
+	 * @param res The result of the last command.
+	 */
+	static void SetLastCommandRes(bool res);
+
+	/**
+	 * Store a new_vehicle_id per company.
+	 * @note NEVER use this yourself in your AI!
+	 * @param vehicle_id The new VehicleID.
+	 */
+	static void SetNewVehicleID(VehicleID vehicle_id);
+
+	/**
+	 * Store a new_sign_id per company.
+	 * @note NEVER use this yourself in your AI!
+	 * @param sign_id The new SignID.
+	 */
+	static void SetNewSignID(SignID sign_id);
+
+	/**
+	 * Store a new_tunnel_endtile per company.
+	 * @note NEVER use this yourself in your AI!
+	 * @param tile The new TileIndex.
+	 */
+	static void SetNewTunnelEndtile(TileIndex tile);
+
+	/**
+	 * Store a new_group_id per company.
+	 * @note NEVER use this yourself in your AI!
+	 * @param group_id The new GroupID.
+	 */
+	static void SetNewGroupID(GroupID group_id);
+
+	/**
+	 * Store a allow_do_command per company.
+	 * @note NEVER use this yourself in your AI!
+	 * @param allow The new allow.
+	 */
+	static void SetAllowDoCommand(bool allow);
+
+	/**
+	 * Get the pointer to store log message in.
+	 * @note NEVER use this yourself in your AI!
+	 */
+	static void *&GetLogPointer();
+};
+
+#endif /* AI_OBJECT_HPP */