A new 5 digit train numbering scheme is being introduced for all trains on Indian Railways with effect from 20th December, 2010.
All express trains of South Central Railway (which start with no. 7) and superfast trains (which start with no. 2) will be prefixed by no. 1. Citing an example, train no. 7256 Hyderabad-Narsapur express will be renumbered as train no. 17256 and train no. 2723 Hyderabad – New Delhi A P Superfast Express will be renumbered as train no. 12723.
All the passenger trains, Diesel Electric Multiple Unit (DEMUs), Diesel Hauled Multiple Units (DHMUs), Main Line Electric Multiple Units (MEMUs), MMTS sub-urban services will also be renumbered with 5 Digits.