The only issue is lack of fourth line to run MEMU daily passengers. If u might have noticed, If any Rajdhani is reschduled such that it depart NDLS post 6pm. It always takes 3-3.5 hours to reach ALJN as daily MEMU from SSB,NZM,DLI,NDLS depart back to back. As heard this trains have high priority (just like any other Metro city) but since we only have 1 down line the SF tend to trail them and suffer.