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diff --git a/src/ai/api/ai_accounting.hpp b/src/ai/api/ai_accounting.hpp
deleted file mode 100644
index a68571805..000000000
--- a/src/ai/api/ai_accounting.hpp
+++ /dev/null
@@ -1,65 +0,0 @@
-/* $Id$ */
-
-/*
- * This file is part of OpenTTD.
- * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
- * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
- * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
- */
-
-/** @file ai_accounting.hpp Everything to handle AI accounting things. */
-
-#ifndef AI_ACCOUNTING_HPP
-#define AI_ACCOUNTING_HPP
-
-#include "ai_object.hpp"
-
-/**
- * Class that keeps track of the costs, so you can request how much a block of
- *  commands did cost in total. Works in both Execute as in Test mode.
- * Example:
- * <pre>
- *   {
- *     local costs = AIAccounting();
- *     BuildRoad(from_here, to_here);
- *     BuildRoad(from_there, to_there);
- *     print("Costs for route is: " + costs.GetCosts());
- *   }
- * </pre>
- */
-class AIAccounting : public AIObject {
-public:
-	/**
-	 * Creating instance of this class starts counting the costs of commands
-	 *   from zero. Saves the current value of GetCosts so we can return to
-	 *   the old value when the instance gets deleted.
-	 */
-	AIAccounting();
-
-	/**
-	 * Restore the AIAccounting that was on top when we created this instance.
-	 *   So basically restore the value of GetCosts to what it was before we
-	 *   created this instance.
-	 */
-	~AIAccounting();
-
-	/**
-	 * Get the current value of the costs.
-	 * @return The current costs.
-	 * @note when nesting AIAccounting instances all instances' GetCosts
-	 *   will always return the value of the 'top' instance.
-	 */
-	Money GetCosts();
-
-	/**
-	 * Reset the costs to zero.
-	 * @note when nesting AIAccounting instances all instances' ResetCosts
-	 *   will always effect on the 'top' instance.
-	 */
-	void ResetCosts();
-
-private:
-	Money last_costs; ///< The last cost we did return.
-};
-
-#endif /* AI_ACCOUNTING_HPP */