The 17-km Duhai-Sahibabad priority section of the ambitious Delhi-Meerut RRTS corridor, on which trains will run at three times the speed of metro trains, is expected to get operationalised by April, official sources said on Friday. “Operations were slated to begin from June earlier but are expected to begin by April now. The trains on the RRTS corridor will run at three times the speed of metro trains,” one of the sources told PTI.