Are there enough security safeguards at MRT stations?

While it is good to be forewarned about terrorism, we should also question whether we have done enough to minimise the chances of a terror attack ("Prepare for the inevitable: terror at home"; July 6).

One area which I am concerned about is MRT stations.

On a few occasions while taking the MRT, I have noticed some people on the opposite train lines who seemed to be intently focused on the commuters entering and leaving other trains.

Although they could very well have a valid reason, I could not help but wonder about their motive and if they could be dangerous.

Do train stations install police cameras or closed-circuit television systems?

Could the stations capture the duration and frequency of visits of commuters, and their identities?

Gan Kok Tiong