Recently when i was travelling in this train within kerala from ernakulam till coimbatore, the ac coach attendant of Tata Alleppey express was telling the same thing that the tata-alleppey express will be changed to run as separate train till alleppey and dhanbad express will run as separate train till trivandrum.It seems work on pit lines at Tata is almost complete and sooner than later this might become a reality!!!
Lets hope it happens soon.