A double-decker coach can carry 128 passengers in comparison to 78 in a Shatabdi chair car, increasing the capacity by about 70 percent. With lower weight per commuter, the coaches are more energy efficient. South India’s first AC Double Decker train successfully completed its trial run from Chennai to Bangalore on Sunday. Reducing travel time from Bangalore to Chennai by nearly three hours will be possible, as the double-decker express coaches are designed and built to run at 150 km per hour on upgraded tracks with no stoppages, a senior South Western Railway (SWR) official told. Once the service starts, the train will leave Chennai at 7.25 a.m. and reach Bangalore city at 1.20 p.m. It will leave Bangalore at 2.40 p.m. and reach Chennai at 8.40 p.m. Of the seven direct express/mail trains operated between the two cities, two are Shatabdis on six days a week, which run at 110 kmph, and two are inter-city trains that take over six hours due to their many halts.