Distance matters. For. LHB rake the scheduled maintain PM should be done every 4000km and if one way distance is more then 2000km they need to do SM an require 8-10hrx turnaround time That is the reason Kanyakumari Mumbai is curtailed to Pune. As the rake doesn't need maintainance the turnaround time at destination is 2-3 hrs for watering cleaning and basic inspection.