i can explain, when a train leaving PF1 and take opposite (wrong ) track then train from MAS side can enter into PF. Also if train passed outer then by the time it enters into PF , PF1 train can leave. I have seen it many times. Its all depends on controllers that time.
Also there is no need of allowing passing trains via PF1, its complete mismanagement. PF8 gets almost same facilities as PF1. Originating and destination trains can use PF1,2. Later they can be pulled upto Jnanapuram side and then they can be shunted towards coaching complex when train leave from PF5 or 6. Its very easy to maintain trains at VSKP which is having 8 PF. Also adding...
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3rd line from 3-4 km will make wonder. Its is as Railways has land to add another 6 parallel tracks at VSKP.
Its all mismanagement by ECoR making a station like VSKP became a bottle neck for many. Until diversion started things happened fine. Later when some trains diverted back, this all issue started of mismanagement.
They just want to prove VSKP is over crowded and trains has to divert. Their main target is VSKP bound trains only, so that people think that diversion is better. Many people tweeting the same with railway ministry. Any ways lets see how many months still it will continue.