I just wondered if such a system was running, typed in Google search and Found yes it is. Basically you can see how late the train is running currenlty and when it is scheduled to arrive, much better than dialing that 131 number all the time.
What could be better is to make is more updated. I am seeing this as 2:33 AM and the last updat time is shown to be 6:57 AM yesterday. This is not much relevant and satisfactory but at least they are working towards this.