Many people take them to work, so they have to be.

S_M's suggestions about security are good as security suggestions. The problem is with implementation. The train system was designed as an open system, much of it in confined space, without a lot of room or patience to conduct the kinds of security procedures he suggested. Taking the train isn't like flying.

Also, when you consider that police and firefighters are being laid off because local and state governments are overextended, I don't know where the extra money is going to come from to provide personnel, facilities and equipment for this kind of security.