void add_train(Train3D &);
void remove_train(Train3D &);
Train3D &get_train(const Train &) const;
Msp::GL::Scene &get_scene() { return scene; }
Msp::GL::Scene &get_endpoint_scene() { return ep_scene; }
void add_train(Train3D &);
void remove_train(Train3D &);
Train3D &get_train(const Train &) const;
Msp::GL::Scene &get_scene() { return scene; }
Msp::GL::Scene &get_endpoint_scene() { return ep_scene; }