@RequestMapping(value = "/gtfs-realtime/vehicle-positions.action")
 public void vehiclePositions(ServletRequest request, HttpServletResponse response)
     throws IOException {
   FeedMessage vehiclePositions = _gtfsRealtimeService.getVehiclePositions();
   render(request, response, vehiclePositions);
 }
 @RequestMapping(value = "/gtfs-realtime/alerts.action")
 public void alerts(ServletRequest request, HttpServletResponse response) throws IOException {
   FeedMessage alerts = _gtfsRealtimeService.getAlerts();
   render(request, response, alerts);
 }
 @RequestMapping(value = "/gtfs-realtime/trip-updates.action")
 public void tripUpdates(ServletRequest request, HttpServletResponse response) throws IOException {
   FeedMessage tripUpdates = _gtfsRealtimeService.getTripUpdates();
   render(request, response, tripUpdates);
 }