Air dryer for freight stock electric locomotive as per RDSO Spec. No. MP 0.01.00.06, Rev.-5, March-11, STR No. MP STR.BK.01.06.11, Rev.-00, July-11 as per Drg.No. RDSO Specification. No. MP 0.01.00.06, Rev.-05, March-2011, for WAP-4/WAG-7 Electric