The 22121/22122 Lokmanya Tilak Terminus–Lucknow AC Superfast Express (abbreviated as LTT–Lucknow AC SF Express) is a Superfast Express train of AC Express series belonging to Indian Railways (Central Railway zone) that runs between Mumbai and Lucknow in India. It was introduced on 8 April 2017, with fully air-conditioned LHB coach. It is a weekly service. It operates as train number 22121 down from Lokmanya Tilak Terminus to and as train number 22122 up in the reverse direction. This train shares its rake with Lokmanya Tilak Terminus–Hazrat Nizamuddin AC Express. Coaches The LTT-Lucknow AC Superfast Express generally has one AC 1st class coaches, three AC 2 tier class coaches, one pantry car, two luggage cum generator coaches and fifteen AC 3 tier coaches, for a total of 22 coaches. As is customary with most train services in India, coach composition may be amended at the discretion of Indian Railways depending on demand. It has fully air-conditioned LHB coach. EOG consists of Luggage and Generator coach B consists of AC 3 Tier coach PC consists of Pantry car coach A consists of AC 2 Tier coach H consists of First Class AC coach HA consists of First Class AC 2 Tier coach Schedule 22121 AC Superfast Express leaves Mumbai LTT every Saturday at 14:20 hrs IST and reaches the Lucknow Charbagh at 13:45 hrs IST on the next day. On return, the 22122 AC Superfast Express leaves Lucknow Charbagh every Sunday at 16:20 hrs IST from platform number 3 and reaches the Mumbai LTT at 17:30 hrs IST on the next day. Service The LTT-Lucknow AC Superfast Express covers the distance of in 23 hours 25 mins (60.00 km/hr) at an average speed of 60 km/h (including halts) and while on its return journey as train number 22122 takes 25 hrs 10 mins at an average speed of 56 km/h (including halts). Its highest attained speed is 118 kmph between Nasik and . As the average speed of the train is above , as per Indian Railways rules, its fare includes a Superfast Express surcharge. Routeing The 22121 / 22 Lokmanya Tilak Terminus–Lucknow Charbagh AC Superfast Express runs from Lokmanya Tilak Terminus via , , , , , , to Lucknow Charbagh. Traction As the route is electrified, all types of electric locos power the train up to its destination. The LTT-Lucknow AC Superfast Express is mostly hauled by Kalyan-based WAP-7 or