There's not a lot the MTR can feasibly do. MTR (esp ex-KCR lines which have large sections above ground) is not weather-proof.

Once the power lines get cut by falling trees, all MTR can do ask passengers to walk to stations. There's no feasible rescue - some vechicle insurance might not be valid for accidents in T8 or above, and in any case there are safety issues anyway. MTR passengers have to stay in the station until lines are restored or road transport becomes available, whichever is earlier.

There are allegations that MTR staff asked passengers to leave the station http://www.thestandard.com.hk/news_d...=20120725&fc=4 . I don't know what moronic staff will make such a request and if so they should be summarily fired if allegations proven.

The Standard also suggested MTR can keep emergency supplies at stations like AAHK http://www.thestandard.com.hk/news_d...=20120726&fc=7 . Whilst MTR can definitely consider it, the frequency this happens is a lot less than HKIA and MTR passengers are stranded for a lot shorter time than HKIA.

But other than that it's really life. What can MTR feasibly communicate? You either wait for the first train to show up or the first taxi to arrive back at the rank. It's not like you have to go back home to wait or reroute on another line.