Source: IRCTC website
There is big saving in time of Mumbai-Chennai daily trains. 12163 is speeded up by 1.5 hours and will leave from LTT instead of DR and travel to MAS instead of MS, while 11041 will see saving of over 4 hours making it superfast. It will be renumbered as 22159. 11027 will save almost 5 hours, becoming superfast (and up to MS as opposed to MAS at present) as well with a new number 22157. 17031 will also save over an hour by leaving CSMT late by an hour and 15 minutes. It will exchange timings with 22159(11041).