Indian Railways — unnecessarily delaying train from scheduled time

Train no. 12920.
Name - Malwa SF Express
From pathankot to new delhi
The train departed pathankot station as per scheduled time everything was going good but suddenly one stop before jalandhar staion our train stopped. I don't remember that station name as it was any local station but our train remain approximately for an hour and after that this train keep lagging from its scheduled time as now it stop for 15 min in every local station. On asking officials about the cause of delaying train they said its because of maintenance of track but i doubt that because other train using same track are on time...