Even after so many months of implementation of 6th Pay Commission no decision has been taken for the eligibility fist class/ 3AC pass. It seems that rules are still under consideration in Board office. Nobody knows how long it will be "under consideration". An apparent problem is that every 6500-10500 scale has not been 4600 grade pay in 6th CPC.
It should be noted that Central Govt employees other than railways having 4200 grade pay and above can travel in 2nd AC on duty, whereas railwaymen appointed after 1987 , even though they reached 4200, 4600, 4800 Grade pay are not eligible for the same.