Nice request. Always had this in mind.
I would like to share my views on Cholan Exp too.
1. Using a Sleeper Rake for Cholan was a bad idea, but they had to do it; understandable.
2. My suggestion would be to consider all SL coaches as 2S and all 3A coaches as CC; Cause there is a written rule that 0700-2200 would be...
more... considered as day time. Though gud thing is passengers adjust among themselves.
3. With current scenario, half the passengers pay extra fare (SL) even when they are travelling only during day time and the other half pays 2S fare.
We were supposed to get 4 Antodya Rakes (TBM-SCT) and (TBM-TEN). Not sure both would be introduced.
Instead they could think about allotting a couple of rakes with little modification like making it reserved coaches, adding 2 CC for Cholan.