http://mdn.mainichi-msn.co.jp/waiwai/archive/news/2002/08/20020817p2g00m0dm999000c.html
In Japan, the train operators can and have successfully sued the
families iof people who commited suicide on the tracks for a lot of
money.
I'm sure SMRT is looking into the possibility of doing the same in
Singapore 
From the article:
Committing suicide carries the ultimate cost -- life. But just in
case anyone thinks that taking their own lives would be an easy way
out, perhaps a little deeper thought is called for. In addition to
the grief, heartbreak and emotional burdens that come with suicide,
comes a very hefty price tag. Although Shukan Hoseki
(10/1/9
notes a vast majority of Japan's 25,000-plus
suicides a year take place in the homes of those that choose to
die, a popular method for many people is jumping in front of a
train. And because so many commuters are affected, railway
companies charge relatives of the victim exorbitant fees.
"Trains don't usually stop too long after a suicide, there's rarely
much damage to carriages and we rarely have to send anyone off to
catch trains on different lines. In that regard, train suicides
probably don't cost too much," says an employee of a commuter line.
"But to make sure we can cover the costs incurred when a suicide
leads to a derailment, we have to ask the bereaved families of
suicide victims to compensate us. The costs are usually in the
range of 100 million yen, but I've heard of a case where a family
was billed 140 million yen after someone killed themselves by
jumping in front of a train."
