They already have a back plan to reduce AC Economy fares if & when protests happen. They seem to want it.
Anyways, subsidized fares are not good for the country, & the actual cost of non AC is only 20/25 % less than Equivalent AC travel. No one can imagine a Revision of this level. BUT Increase of SL Fares without raising AC Fares is ABSOLUTELY NECESSARY in order to save the non AC Sleeper class.
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Tag the Railway minister on twitter to increase SL fares without increasing AC fares, that is the best option we have now.