Driver &driver = layout.get_driver();
turnout_id = driver.add_turnout(turnout_addr, type);
driver.signal_turnout.connect(sigc::mem_fun(this, &Track::turnout_event));
Driver &driver = layout.get_driver();
turnout_id = driver.add_turnout(turnout_addr, type);
driver.signal_turnout.connect(sigc::mem_fun(this, &Track::turnout_event));