In ABFC-BLK doubling also before placing the sleepers, ballast were unloaded from dumpers and trucks and then sleepers were laid....... but after laying the tracks BOBYN rake lay the ballast,,,,,,,,, same happened in FKM-DBB section GC too....
if a loco can be used to do trial run on a track which has been recovered from a washout in northbank lines.... then why not a BOBYN can ply on a semi-ballasted trck??