So in these 3 months from Feb to April they are days when the min occupancy is below 800 or 80% in ACC during weekdays. The days may be in Feb month. I have quoted this that the train doesn't get full occupancy from June 15 till Oct 1st and in Feb which are considered as non season for tourists to Sikkim and Darjeeling. The train has excellent advance booking from March 15th to June 15th for about a month and from Oct 1st to Feb 1st for atleast a week which are tourist seasons.