Mumbai Central–Ahmedabad Double Decker Express  12931 / 12932 Mumbai Central - Ahmedabad Double Decker Express is a superfast express train belonging to Indian Railways that runs between Mumbai Central (BCT) and Ahmedabad Junction (ADI) in India. It runs 6 days in week except Sunday. It operates as train number 12931 from Mumbai Central to Ahmedabad Junction and the train number 12932 in the reverse direction. On 20 March 2017, the exteriors of the train departing Mumbai Central were covered with vinyl wrapping advertisements becoming the Indian Railway's first "branded" train. The advertisements were for soap brand Savlon, as part of its Savlon Swasth India Mission, a social awareness initiative for promoting hand hygiene.  12931 / 12932 Mumbai Central - Ahmedabad Double Decker Express had 12 AC Chair Car & 2 EOG cars. As with most train services in India, coach composition may be amended depending on demand.  12931 / 12932 Mumbai Central - Ahmedabad Double Decker Express was first introduced on 19 September 2012. it ran 6 days except Sunday. It covers the distance of 491 kilometres in 7 hours 20 mins as 12931 Mumbai Central - Ahmedabad Double Decker Express (66.95 km/hr) & 7 hours as 12932 Ahmedabad - Mumbai Central Double Decker Express (70.14 km/hr). Since Western Railways switched over to AC electrical power in February 2012, it has been hauled by a WAP 5 or WAP 7 engine from the Vadodara shed.