This point is not justified there are many examples of headquarters and divisions which don't own much trains, and provide trains to the deserving. Hajipur is an example.
Talk about Prayagraj, I have already expressed my views for the pride city earlier, commenting more on this view would invite a brigade of attackers with fake accounts.
Delhi-Howrah route is not the only important route, and prayagraj is not the only important station.
They...
more... are much other routes which are more congested and some cities are way more bigger than Prayagraj still politics is at it's peak!
You just can't merely run away from facts when it comes to politics, Capital suffers the most when to comes to Rail Politics.