Due to upgradation work of Delhi P.R.S. (Computerized Passenger Reservation System), the PRS Enquiry will remain closed for 4 hour 40 minutes from 11.30 p.m. on 18.4.2012 to 04.10 a.m. on 19.4.2012.The PRS & NTES related enquiry of Delhi PRS at various interfaces including 139 and functioning of current reservation bookings through computer will also remain closed during the period.