जिंदगी में शादी के अलावा ट्रेन में RAC ही एक ऐसी स्थिति है,जिसमें दो अजनबी साथ निभाने को मजबूर होते है। - Junaid

I had posted a blog to run SK upto Islampur
Obviously, SK is used by many pax of Patna and their fav train, so that extension was never feasible.
But, there are many other small towns/cities which also need a train and most importantly punctual train because many students from those places also study/work in delhi.
SK is NON STOP train and it benefits...
more...

only one section.
So Magadh exp is as IMPORTANT as SK, and hence running it punctually will benefit much more people.
Mahatma Gandhi once said that real India lives not in metros but in small cities/towns .... I hope one day IR realizes that and give importance to trains connecting small places also.