- void add_vehicle(VehicleType &);
- const VehicleType &get_vehicle(const ArticleNumber &) const;
- const VehicleMap &get_vehicles() const { return vehicles; }
-
- void add_signal(SignalType &);
- const SignalType &get_signal(const ArticleNumber &) const;
- const SignalMap &get_signals() const { return signals; }