Well, you really need a second lock of some type for the cable for the most effectiveness.

As far as where to park your bike well, check out this vid http://www.neistat.com/movies/bikethief/index.htm

Do you really think people would say anything if they noticed a bike getting ripped off?
If a thief wants your bike they will get it no matter where you park it. Where is the parking in the train station?