Most important and the basic difference between government and private sector which we all have studied in the school is that government is for the service of the people and private is only profit oriented.
Even if the fares of sleeper is increased equivalent to giving profits still you are not satisfied just because it would give less profit. This is not acceptable.
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When we have transportation options for every category of people from flights to trains to roadways then and no category of people interfering in other modes of transportation then we should leave railways as it is.