Just to add some information in the thread, I remember the following delays during 2018. PSK appearing in the attachment was ultimately 70+hrs late when it reached destination.
Also a quite unique incident occurred during the same time (refer last screenshot), (the then) current day 13006 overtook the previous day 13006 near Jhajha.
Now...
more... coming to most delayed train, I remember it was the Swatantrata Senani Express which registered more than 80 hours delay in one of its run, making it to the headlines in some newspaper of Bihar. I don't have the records though.