catalogue.signal_track_added.connect(sigc::mem_fun(this, &Catalogue3D::track_added));
catalogue.signal_vehicle_added.connect(sigc::mem_fun(this, &Catalogue3D::vehicle_added));
catalogue.signal_track_added.connect(sigc::mem_fun(this, &Catalogue3D::track_added));
catalogue.signal_vehicle_added.connect(sigc::mem_fun(this, &Catalogue3D::vehicle_added));