Hi Mr. Praveen Kumar,
Repair and Maintenance work for railways are not exempted from the Service Tax. As per the mega exemption notification (25/2012) only the original work is exempted for Railways, roads etc., The original work meaning is given below:
Explanation 1.- For the purposes of this rule,-
(a) "original works" means-
(i) all new constructions;
(ii) all types of additions and alterations to abandoned or damaged structures on land that are required to make them workable;
(iii) erection, commissioning or installation of plant, machinery or equipment or structures, whether pre-fabricated or otherwise;
As refer by you the principal notification of 24/2009 was rescinded vide notification no 34/2012 - Dt. 20.06.12, hence the said notification is not valid now.
So, the Railways are not exempted for Repair and Maintenance work.
M.Padmanaban