RailFans don't miss their train. Why? Because they go to the station HOURS before the actual departure of their Train - to watch OTHER trains depart. - Prince Maan

RTI is the Right to Information Act ! What will you find with an RTI?
How many trains have been standardized with this configuration? Why are railways doing this?
They will justify their actions with some bullshit reason like aerodynamic efficiency is increased with AC coaches requiring less power etc.
The truth is while drag increases with the square of velocity, IR was already...
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running a lot of train with 130 with previous rake configurations with some 10 sleeper coaches. And upgradation to 160 will take atleast a decade to become a reality. Moreover there aren't enough WAP5s present to haul those trains. What will they use WDP4s?
Maybe trainsets are the way ahead, but rather than abruptly slashing so many sleeper coaches, they should have had the courage to increase the heavily subsidized Sleeper fare!