A Duronto express from Bengaluru to Mumbai via DMM, GTL, SUR, PUNE is possible. And timing is also possible if the train departs at 3pm from YPR or BYPL and reach MMCT or DD by 7am or 8am.
Bengaluru to solapur it should be electric engine.
From solapur to Mumbai, it should run with diesel until Daund to solapur electrification is done. The take should contain 10sleeper class, 5 AC 3-tier, 2 AC 2-tier, 1 First AC, 2 luggage cum brake van.