also because of the fact that there are less intercity trains,DEMUs,passengers in NBQ-NCB-NJP section at any designated time........even if there are some,the running is not punctual(though nbq-smta section is performing exceedingly well after the doubling and is the only solution in GHY-NJP area)
but with the advent of some intercities notably
1.KAMAKHYA-NEW COOCHBEHAR-ALIPURDUAR JN INTERCITY
2.LUMDING-KAMAKHYA INTERCITY
the...
more... customer behaviour has changed and are shifting to these intercities for example people are increasingly availing APDJ-NCB-KYQ Intercity exp.