1) Click on www.indianrail.gov.in (2) Select option Train between stations (3) Put source as DHN or any other station for this train, then select destination as ERS or any other [PGT,ED etc] (4) Check in any date for Sep and then for Oct. You will then see the difference in time. Up till Sep 25, old time features and then from Sep 26, new time table features between Chennai & Allp.
Image attached