Work on Patna-Sonepur rail section to complete by February 2022 December 23, 2021 | Electrification, News & Developments The construction work on 11.5 km Patna-Sonepur section of the Digha-Sonepur Rail-cum-Road Bridge Doubling-cum Electrification Project is expected to be completed by February 2022. This content is restricted.