code: function _getTransferStops(db, origin, destination, stop, trip, callback) {
  
    // List of Transfer Stops
    let rtn = [];
  
    // Get Next Stops from this Stop
    LineGraphTable.getNextStops(db, origin.id, destination.id, stop.id, function(err, nextStops) {
  
      // Database Query Error
      if ( err ) {
        return callback(err);
      }
  
      // Get Remaining Stops on Trip
      let remainingStops = [];
      let stopFound = false;
      for ( let i = 0; i < trip.stopTimes.length; i++ ) {
        if ( !stopFound && trip.stopTimes[i].stop.id === stop.id ) {
          stopFound = true;
        }
        else if ( stopFound ) {
          remainingStops.push(trip.stopTimes[i].stop.id);
        }
      }
  
      // Get Next Stops that are remaining on this Trip
      for ( let i = 0; i < nextStops.length; i++ ) {
        if ( remainingStops.indexOf(nextStops[i]) > -1 ) {
          rtn.push(
            trip.getStopTime(nextStops[i]).stop
          );
        }
      }
  
      // Return only the top 3 transfer Stops
      if ( rtn.length > 3 ) {
        rtn = [rtn[0], rtn[1], rtn[2]];
      }
  
      return callback(null, rtn);
  
    });
  
  }
docs: Get a list of Stop IDs, sorted by transfer weight, that can be
  used as a Transfer Stop for this Trip
  @param {RightTrackDB} db The Right Track DB to query
  @param {Stop} origin Origin Stop
  @param {Stop} destination Destination Stop
  @param {Stop} stop Reference Stop
  @param {Trip} trip Trip to transfer from
  @param {function} callback Callback function(err, stops)
  @private