when we sarch for trains 'from' stn to 'to' stn, we get number of trains. These can be viewed in tabular form also. These can be further filtered with 'departure/arrival days' 'time' and classes.
But when a traveller wishes to travel via specific route, he can not find his choice, other than by trial and error.
e.g. Pune to Ernakulam, we have four trains, and Two routes.
Once...
more... we get the search result, same can not be further filtered, for 'via route'.
I have been waiting for this feature to be introduced for long, as this adds to further refining the search.