Some more facts which I know for you and others...
1. A Shatabdi ran between HWH and TATA. Cuz of poor occupancy, it was permanently cancelled and a Jan Shatabdi was introduced on same route upto Barbil.
2. Ispat Express originally ran from HWH to TATA and was then extended to Rourkela. After that, it was extended to Jharsuguda and then Sambalpur and then to its current origin/destination...Titlagarh.
3....
more... There used to run a train between TATA and PNBE which was basically a type of non AC Shatabdi. It used to depart from TATA in the morning and had only 2 intermediate halts. 1st one was at Asansol (for reversal) and the 2nd one was at Jasidih. The train was non-stop between Jasidih and Patna. It departed 6 in the morning and reached Patna at nearly 5-6 in the evening. This train gave the name to TATA DNR Super Express, as it was called Super Express at that time.. Nearly 50-60 years ago