THE new chairman and chief executive of the MTR, Jack So Chak-kwong, yesterday spoke for the first time of his ambition to make the railway the best in the world over the next five years. Mr So, 49, said he was confident he would ride the through-train beyond 1997. Mr So said he would 'embark on a massive property development programme' over the next decade. The former executive director of the Trade Development Council became the first Chinese chairman of the corporation in its 15-year history after his predecessor, Hamish Mathers, retired last month. Mr So said the airport express project would be the most challenging, although the public might have overlooked the enormous scale of the project amid debate over the financial arrangements. 'I remember the television used to show a video clip of the airport railway running through a lot of new developments and bridges to the new Chek Lap Kok airport. 'Now that 25 of 31 major MTR contracts are already let and progress is well under way, that video vision is fast becoming reality,' he said. The airport express will run to the airport from Central in 23 minutes and from Kowloon station in 20 minutes. Both stations will have baggage check-in facilities for the air passengers. The six-car trains operating to a maximum speed of 135 km/h are expected to run at eight-minute intervals. Mr So said an experimental scheme of providing toilets in a couple of the existing stations would soon begin.