diff --git a/src/vehicle_base.h b/src/vehicle_base.h
--- a/src/vehicle_base.h
+++ b/src/vehicle_base.h
@@ -817,6 +817,10 @@ public:
 
 	inline void SetServiceIntervalIsPercent(bool on) { SB(this->vehicle_flags, VF_SERVINT_IS_PERCENT, 1, on); }
 
+	bool HasUnbunchingOrder() const;
+	void LeaveUnbunchingDepot();
+	bool IsWaitingForUnbunching() const;
+
 private:
 	/**
 	 * Advance cur_real_order_index to the next real order.