const Msp::GL::Material &get_ballast_material() const { return ballast_material; }
const Msp::GL::Material &get_rail_material() const { return rail_material; }
const Msp::GL::Mesh &get_endpoint_mesh() const { return endpoint_mesh; }
private:
const Msp::GL::Material &get_ballast_material() const { return ballast_material; }
const Msp::GL::Material &get_rail_material() const { return rail_material; }
const Msp::GL::Mesh &get_endpoint_mesh() const { return endpoint_mesh; }
private: