The issue is basically happening more in the ERS-TVC (section via Allp) where there is single line stretch. What has compounded the matter is couple of trains running in monsoon TT including TVC-Rajdhani and one more TVC-NZM SF. So 3 trains VB, Rajdhani and the NZM train are allowed to cross at the expense of the daily passenger train which leaves on time from ERS and then is detained at the next station (Kumbalam) for more than 45 min. The monsoon TT ends on 31-Oct so there might be some respite. On the other hand railways can try and improve their controlling slightly better. Passengers are saying that instead of detaining for so long at one station, the train has sufficient time to move to couple of stations ahead and this can reduce the delay and crossing can easily happen there.