Indian Railways — unreserved passengers in reserved coaches

Me and family traveled in kanyakumari express (12633, pnr: [protected]) in s1 coach on 16 october. There were 2 issues during this painful journey
1) train was delayed by 2.5 hours when it reached nagercoil. The main reason what i learnt was a stalled goods train in the egmore-tambaram section which was on the same track as 12633. I am at loss of words to understand how an engine which cannot pull the load can be fitted
2) about 30 passengers with general tickets boarded the reserved coach. There was no tte or rpf to regulate at tambaram till tindivanam. Passengers were unable to use rest rooms (Or) sit properly. I had to complain to 138 and this was informed to rpf tindivanam. A police staff called me and assured that it will be sorted. At tindivanam, rpf got into the coach and offloaded some passengers. Again at villupuram, more people were offloaded.

Why railways is not able to protect passengers and why rpf was not accompanying?.