The route would include a 20-km sub-sea tunnel from Mumbai to Thane, said Tomoaki Sawano, manager for planning and sales at Japan International Consultants for Transport Co Ltd (JIC) last night.
JIC has completed a feasibility study last year on the rail project which is to be operational by 2023.
The project's engineering design work will include a number of tunnels and bridges, he added.
It would take about four years to complete the engineering design for the entire route construction contracts, which would be awarded in several packages from about 2018, he said at the Singapore International Transport Congress and Exhibition being held October 19-21.
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