The unofficial videos state that IR has taken this decision to permanently cancel such trains because their average speeds are very slow & they also block smooth flow of superfast trains that trail them en route.
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I was thinking that 13049/13050 will be LHBfied since its rakes look quite old and approaching their expiry date on completing 25 years of service life. But here I see IR having different plans with respect to train running in India. Speeding up of numerous trains seems to be their motto :-P :)