One more thing , the main line for reserved passengers is same - Delhi - Jaipur line.
I don't think express trains on rewari-sdlp line provide enough revenues because passenger rush is always for Delhi or jaipur/ajmer. And there are no reserved separate trains on hisar or Rohtak route .
And chetak express , CDG-BDTS biweekly ,DEE-BDTS weekly are the other only Trains which don't go to alwar .
And...
more... 1.5 times of alwar earning in normal times justify a well and good performance for rewari .