Absolutely right Nitish becoz 12305 Rajdhani via MAIN LINE takes 165 mns extra time as compared to 12301 Rajdhani via GRAND CHORD to cover an additional distance of merely 96 kms on the HWH-Mughalsarai stretch, which is hell of a long time considering average Rajdhani MPS. Hence your observation that MPS on GRAND CHORd SECTION is higher as compared to the MAIN LINE is quite justified.