Actually the lines in MRTS section are double discharge platforms i.e. platforms on either sides of the train. Platforms 6&7 , 8&9 in this case. Which means if a train is stationed at PF6, it essentially occupies PF 7 as well. This is the same case for 8&9 too.
PF 1,2,3 are occupied by TBM/CGL/CJ trains.
PF 4 occupied mostly by TRL bound trains and TBM/CGL/CJ trains sometimes.
PF...
more... 5 occupied by TRL bound train.
PF 6&7, 8&9, 10 for MRTS.
Among all the platforms, only 4and 5 can handle lengthier rakes but unfortunately they don't have watering pipe facilities.
.
Unless Chennai get's a full pledged new terminal, the woes are bound to continue.