Ur train has 1 benefit,where there is 1 shortcoming.
Benefit as u stated is,Avoiding Coromandel due to extreme W/L & presently Tiruchirapalli running with 13 SL Coaches,getting AVialability has become easier.
S.C. is the train you've chosen from Chennai Egmore takes a Long route upto Mangalore,via Tiruchirapalli.This train is mainly used by PQ passengers,i.e.,mostly from MS to TPJ & then TPJ to subsequent part.
But...
more... after evaluating everything,I think this Chain deserves a Green(if not Dark Green :-p)