Tender For design, manufacture, supply, erection, testing and commissioning of new 110kv/27kv, single phase, 50hz, gas insulated switchgears (gis) base ac traction substation complete with two nos. of 110 kv/27kv, 40/56 mva transformers including 25kv switch gears(gis), outgoing feeder arrangement, foundations, structures & all ancillary equipments at dativali in kalyan-thane section of mumbai division of central railway