code: def _TravelTimes(self,triplist,index=0):
      
  
      def DistanceInTravelTime(dep_secs, arr_secs):
        t_dist = arr_secs-dep_secs
        if t_dist<0:
          t_dist = self._DUMMY_SEPARATOR # min separation
        return t_dist
  
      if not triplist:
        return []
  
      if 0 < index < len(triplist):
        trip = triplist[index]
      else:
        trip = triplist[0]
  
      t_dists2 = [DistanceInTravelTime(stop[3],tail[2]) for (stop,tail)
                   in itertools.izip(trip.GetTimeStops(),trip.GetTimeStops()[1:])]
      return t_dists2
docs: Calculate distances and plot stops.
  
      Uses a timetable to approximate distances
      between stations
  
      Args:
      # Class Trip is defined in transitfeed.py
      triplist: [Trip, Trip, ...]
      # (Optional) Index of Triplist prefered for timetable Calculation
      index: 3
  
      Returns:
      # One integer for each pair of stations
      # indicating the approximate distance
      [0,33,140, ... ,X]