And just to make it clear that I don't have anything against the Kalka mail or any 'prestige' - I made a serious attempt to get the history of these trains when I could not find any inaugural notifications in any newspapers of that era that I could find.
I contacted ER's office after they did the 150 year celebrations for Kalka mail in 2016 with an RTI request asking them to share any documents they had about the official notification - but I got a reply stating that the office did...
more... not have any documents about it. They just shared the newspaper article that was published on that day again. (the write up was given to the CPRO by railfans - some who used to be on this site, from what I gather - it wasn't based on official records)
click here - RTI reply
I have no bias against any train or any bias for a train - I did whatever I could do to find the details and I only share the information when I am confident that I understood the chronology.