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
Sent from my iPhone