NHSRCL achieves breakthrough of mountain tunnel under Mumbai-Ahmedabad High-Speed Rail Corridor Project October 6, 2023 | High Speed Rail Corridor, Mega Programmes, Project Updates, Under Construction NHSRCL achieved breakthrough of the mountain tunnel in Valsad district of Gujarat under Package C-4 of the Mumbai-Ahmedabad HSR Corridor Project on October 5, 2023. This content is restricted.