see the complicated ald junction.
sampoorn kranti and patna rajdhani reaching soon at naini junction and at same time ltt rjpb express will reach at naini.
if either wait then she got late.
suppose they pass 12393 and 12309 then 13202 will reach at ald at 00:40.
then...
more...

after vikramshila and jabshadharan reach ald so there become match with 13202 and 12388, 12368.
if either one halted at outer then there become again queue and if 13202 halted for adfitional 20 mins then mahanagri have to wait at naini or at ald outer.
if mahanagri came at outer and halted there for around 40 min then you can imagine the scinerio so either VS or jansadharan have to halted at outer. 13202 took 20 min after departing so if they again proceed both trains then after mahanagri will enter in ald at 01:30. after revarsal again same problem. one side sampoorn kranti approach ald and another side 16360 and 12166 waiting at outer bcoz both under goes LR.
again confusion and pressure bcoz mahanagri have less termination time at bsb so it have to reach as early as possible for avoid effect from next journey so they departed mahanagri so that pf can be used by 12166 and 16360. if mahanagri even depart at 2 am with avoiding sampoorn kranti bcoz that one cant reach ontime and return journey will not be affected.
result - isse better controlling RF btaaye bcoz mahanagri bermuda triangle me 2 ghante late ho gai aur agar sk, sealdah, poorva and duronto ne bhi overtake kia to aur jada late hogi.