Missing train_uid property in Train Movement feed

[Jacob Ellis]

I’m using stomp to fetch Train Movement data but I think the response is missing the train_uid property which I need to link up to the static schedule data as documented here: 

https://wiki.openraildata.com/index.php/Train_Activation

The Network Rail topic I’m using is  TRAIN_MVT_EM_TOC.

Take a look at this screenshot which shows the train_uid is missing in the response. Does anyone have any ideas?

[James Uppington]

That's a departure message, in which the TRAIN_ID field is the identification.

The activation message is where a TRAIN_UID is assigned a TRAIN_ID which will be used in later TRUST messages, such as the departure message you've shown in your post.

From James Uppington

upp...@gmail.com

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[Jacob Ellis]

Do you know how to link a Departure or Arrival event message, from a Train Movement topic, to the static schedule data?  

[James Uppington]

Yes:

Log the given TRAIN_ID when the activation message is received. The activation message will also contain the TRAIN_UID, linking it to the schedule data.

Then use the TRAIN_ID to track that train across its journey.

Effectively, the activation message gives you the unique (within a month) identifier (the 10 character TRAIN_ID) for that day's instance of the train in the schedule.

Without logging the activation message, you can't link arrivals and departures back to the schedule.

From James Uppington

upp...@gmail.com

Sent from my iPhone

[Jacob Ellis]

Thank you for your help James, that makes sense now!