M not into failure or success,,but just highlighted not to link premium wih elite!!! AC class in IR isnt remain elite now & leakage happening coz of airline shift out of no available berth cant be compesated by SL Coaches!!! Its simply to offer lower class accomodation to some1 who willingly can pay hefty amount to agents/touts or instead, easily can board flight!!!
SL..yes SL Coaches gets utilized as Special run or in premium, where SL demand is critical...
Duronto didnt failed but several non-demanding route made few as failure...& same goes well...
more... for Premium Exp...Further, Duronto are regular, while Premium are heavy seasonal temporary trains...
Not all SL equipped Duronto are success and neither SL equipped Special runs zam-packed....When all these dont happen, thn its better not to bet Premium with SL as full pack run!!!