Thank you so much for your reply. Got many insights from it.
I have posted my above questions on a youtube video's comments section which is Mr. Namjoshi's interview by a local railway reporter. click here
Let's...
more... see if I get any answers from the channel's owner.
Fun Fact: One of the comments in the same video says anyone can meet Mr. Namjoshi in Sumitra Mahajan's office between 12 and 2 pm on working days. This denotes how closely he works with her.