Regardless of the number of SL coaches the train has railways have to ensure that the passengers with confirmed ticket travel with dignity without any nuisances from unauthorised people in the coach. Second even a person travelling in UR class has paid for the seat so railways should have ensured that these coaches never get crowded beyond the seating capacity but sadly be it with trains or buses unreserved class was and still is associated with overcrowded mess the root of the problem being our such huge population and I don't think of a possible solution incase of short distance unreserved passengers who travel to travel everyday for their bread and butter but atleast in long distance trains there is a solution as Mridul sir had pointed out converting GS coaches to 2S in long distance trains and secondly ensuring that unauthorised people are not allowed to enter in the trains...
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at cost by the RPF and if they do they are fined accordingly and made to deboard at the next station.
Also there is a mentality among many Indians that they don't care about the well-being and comfort of others like for eg. whenever I travelled in 12779 after Pune i have seen people enter the SF train in SL coaches asking people to adjust to find a seat as if the train belongs them at ANG and get down at BAP and they do it everyday in this case they are travelling to their work but that doesn't give them the right to board in reserved coaches of a long distance train and cause inconvenience to the passengers travelling with confirmed tickets and most of these miscreants travel without a ticket too. I bet ANG and BAP are served pretty well with MSRTC buses but no they feel they have the birthright to travel in a train passing through their town irrespective of what category of a train it is.