you are asking how to file tdr when there is no internet connection available and I have same query
Suppose a train departs at 1 am like you said from a remote place
And person has no net connection with him
Then, He has to wait atleast till 9am the next day for cafe to open
And...
more... in remote places also dificult to find Internet cafe
And suppose his next train is at 10 am then he will look to board train and not go to cafe to cancel ticket.
Best is not to cancel journey/miss train
.
I really think that railway believes that these days everyone uses android phone with 3G/2g conn ..