I think most likely it's after LTE, because 069/070 was one of
the LTE trains scheduled to return to UPD after service (TRN201-203
returns to CGD, TRN204-206 returns to UPD). I can say 071/072 is a
DNB train as well.
I think DNB trains can mean anything (After morning peak, after
LTE, after evening peak etc.). Best is that this thread only serves
for spotting of test trains.