MUMBAI's INFRA FREN-nnZY
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Metro-rail:   started on 180km for Rs84,000cr at 466cr/km.         
                   proposed on 136km for Rs50,000cr at 366cr/km.
Mumbai Metro Network when completed in 2026: 337km, 225 stations, 13m daily ridership!! Link
"The carrying capacity of the completed Mumbai Metro network will be more than the combined existing loads of Mumbai suburban trains, buses and taxis".

Mumbai-Ahmedabad High-Speed Rail: 508km for Rs110,000cr at 216cr/km.
Construction in over-drive as land acquisition is mostly done. Maha govt is reviewing its earlier go-ahead but is unlike to stop it.

Mumbai-Nagpur e-way: 701km for Rs55,400cr at 79cr/km.

Mumbai Trans-habour bridge: 22km for Rs14,000cr at 636cr/km.

Metropolitan region of Mumbai

Coastal Roads:
  started on 10km for Rs12,000cr at 1,200cr/km.       
  proposed on 19km Nth section is not costed.
8-lane road extensions to Bandra-Worli Sea Link (Sth to Priyadarshini Park and tunnel to the Marine Drive; and Nth to Kandivali and beyond). Work between Worli-Marine Drive was stopped after HC cancelled green clearances, but SC stayed this and allowed land reclamation. Work has already recommenced.

Alibaug-Virar multi-modal corridor: 126km for Rs13,000 at 103cr/km.
An 8-lane road encloses Greater Mumbai & Navi Mumbai suburbs and transverses N-S in the Metropolitan region of Mumbai. The first phase to start in Q1 2020, connects Virar to Balavali (79km, Rs 9,326cr), followed by Balavali to Alibaug (47kms).