But this is what indianrail.gov.in says--
-- 75% in 2nd class, SL, 1st class, 3AC, AC chair car
-- 50% in 1AC and 2 AC
-- 25% in 3AC & AC Chair Car of Rajdhani/Shatabdi trains
--...
more... 50% in MST & QST
-- One escort is also eligible for same element of concession