If Railways want to extend Maharashtra Exp (Passenger) to Durg, they should start a daily Superfast between Gondia and Kolhapur, an actual Superfast Express. It is totally wrong to extend "Maharashtra" Express to another state if the train is earning good (actually high). Instead, they should start another weekly or biweekly train from Durg to Pune if Durg really need it.
There is a Maharashtra Sampark Kranti Express that travels only 125 kms in Maharashtra. At least railways should keep the Maharashtra Express within Maharashtra.