NDLS bound Durontos are bound to be bad so that they are below Rajdhani prioirty. For rest of India Durontos are highest prioirty (better than Shatabdis as former has only few halts while any Shatabadi has numerous). The isssue in NR-ER here is that Durontos have been degraded below SF level despite charging a Rajdhani fare. That is unacceptable. People pay more to save time and can switch to Airlines if not served well