THE number of people intruding into the train track area of above-ground MRT stations has doubled from an average of 16 cases in 2004 and 2005, to 30 in 2006 and 31 last year. So, from next year, platform screen doors will be installed at three above-ground train stations at Yishun, Jurong East and Pasir Ris in a pilot scheme to curb this disturbing trend and enhance passenger safety. And...