Yes i too have a doubt at present they are 5 pitlines but couldn't see the useage as they are not enough originating trains. After LHB fixation of the 3 intercity they hardly need SM upto 2000km and PM after 4000 km which is once is 3 days. May be some of the old pitlines they will use as stable lines as I read BZA is short of them and is reason for delaying arrival of DMM express.