Three of Indian Railways' Southern zones have been severely affected by flash floods, land slips and rockfall as a result of extreme flooding in the state of Kerala.
The Los Angeles County Metropolitan Transportation Authority said the works will improve reliability, safety and the customer experience.
Andrew Constance said the size of the 150m-long TBMs - the equivalent length of two Airbus A380 jets nose to tail - is difficult to comprehend.
What actions are needed when a high-speed railway starts to wear out?
The consortium includes global investor Meridiam and not-for-profit company Windsor Link Railway. Other partners have not been revealed.
Network Rail has applied for the powers to build the next part of the Western Section of the East West Rail project which, once complete, will link Oxford and Cambridge, via Bicester, Milton Keynes and Bedford.
This commitment matches a pledge from prime minister Malcolm Turnbull for A$5 billion to the airport rail link, meaning that construction could begin in 2022. 
Engineers working on a pioneering project to build the world's first light rail line on a floating bridge are getting ready to strengthen the structure so it can to carry track and light rail vehicles.
In a statement released online, Bane NOR said it has "never... been allocated so much money to build railways in Norway".
Entrants are asked to design fully accessible footbridges that can be used across Britain’s rail network and that further improve the legacy of rail pioneers.