Interpolation of prediction time on Darwin Rail data

[jay...@gmail.com]

We are developing journey planner application. We are receiving timetable and push port feed from Darwin. As per Darwin protocol, it only provides the information when there is a change in predicted time to the previously communicated time.

Is there a interpolation rule should be applied to consider the estimated time of the stops between the two stop update of the journey. For example, if we receive 1st stop of the journey is delayed by 10 mins and 5th stop of journey is delayed by 20 mins. Do we need to use the interpolation and consider train is 10 min late for stop 2 to stop 4 as well ?

[Peter Hicks (Poggs)]

Hello

On 5 Apr 2017, at 14:47, jay...@gmail.com wrote:

We are developing journey planner application. We are receiving timetable and push port feed from Darwin. As per Darwin protocol, it only provides the information when there is a change in predicted time to the previously communicated time.

Is there a interpolation rule should be applied to consider the estimated time of the stops between the two stop update of the journey. For example, if we receive 1st stop of the journey is delayed by 10 mins and 5th stop of journey is delayed by 20 mins. Do we need to use the interpolation and consider train is 10 min late for stop 2 to stop 4 as well ?

Are you talking about the case where you receive an ‘rdelay’ attribute for a train running off-route, or the case where you receive updates to forecasts and you’re calculating the predicted lateness based on the difference between the booked and forecast times?

Peter