I was on the spot during the incident. Police/junior-officials tried to convience the passengers of Chennai mail for more than an hour. Whereas passengers want to meet any of the senior official from South western railway. None of officials came on the spot. Many children, ladies were at the station for whole night looks like (Not sure) SWR didn't provide any accomodation, food etc. Passenegers requirement was to add 2 coaches of second sitting in Guhwati or Kaveri express even tough some of them booked A/C coaches looks like which also SWR is not ready to provide.
Railway officer (Could be a junior or Police) has told that "Past 2 days train was coming late and it will come late tomorrow...
more... also, but no action will be taken". When passengers asked for the preventive mechanism officer told "No extra coaches is available for the time being in SWR head quaters".
Finally Railway police went for lathi charge and hitting on the passenegers.