This is ploy by desperate men to win votes. Will the project materialize? Only time can tell. Malaysia is well known for abandoning projects halfway. A drive through Malaysian roads is testimony of this. Everywhere you can see derelict skeletons of buildings that had been abandoned for various reasons.
Mahathir had grand visions. The Multimedia Super Corridor, for one, is a multi-biillon ringgit failure. Next was Mahathir's crooked bridge to replace the historic Causeway that links Malaysia with Singapore. This too ended up in vapor with those who had vested interests suing each other. (This matter had been quietly hushed up.)
Now, Najib has come up with the super idea of starting a high speed railway connection between Singapore and Malaysia? Indeed such ideas were thrown up when the old KTM trains were running between the two countries. There were even proposals to run Singapore's MRT into JB. However, all such thoughts were not given serious attention. And now, hey presto, the two PMs are in serious discussion. Reasons given range from improved travel, more and faster business and others. Could be. The unannounced reasons are plunging political fortunes of both leaders. They hope to reverse their declining popularity at home. While for LHL there is ample time, say about 3 years, Najib has only a few weeks left before he calls for GE. Hence, Najib has to act real fast.
How will the Malaysian electorate respond? A retired friend of mine who travels to JB frequently to meet his old kakis, shared with me that people there are asking what is the urgency for the Singapore-KL link, when there is a real need for this service between Penang and KL as the latter's current KTM services are below par.