Bhopal Shatabdi: chalti hai ek dum hawa ke mafik, speed aisi ke ruka de traffic - Varun

I have some querries. I hope any one can help me to get these answers.
First of all we choose a train. lets train no.15014, Ranikhet Express. This train source station is Kathgodam (uttarakhand), dep. 20.40 and the destination to Bhagat ki kothi (Rajesthan), arr. 18.00. It takes around 22 hrs.
Now the questions are below:
1. Generally how many TTs or...
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Ticket Checkers are present in this train or any other train?
2. For different couches like, Sleeper, 3rd AC, CC, 2nd AC, are the separate TTs or a common TT present in the whole train for checking train tickets from the passengers.
3. Generally how many railway staff present in one time in this train or any other train, like driver, helper, TT, RPF etc.
4. Who will be the head of a moving train, under whose supervision all staff present in moving train will work or follow his instructions.
5. TT will be change after some station or some hours or he will travel from the starting of the train till destination?
6. RPF person will be change after some station or some hrs or he/they will travel from the starting of the train till destination?
7. Who will responsible to look that any unauthorised person, like food vendors (who sell Tea, Coffee, Biscuts, Mineral Water etc.) in a Moving Train? Who will take care or authorised to stop board these type of vendors in a Moving Trains?
If you could help me to find these answers, I will be greatful to you.
Thanks in advance