Since you have asked,you can yourself check District population of Bihar acc to last Census.
And just want to remind you that some Jaunpuriya Lion also used to apply the same logic here. Jaunpur District ka population Varanasi District se jyada hai so Jaunpur should get more trains than Varanasi. Extend all trains from Varanasi bla bla. ЁЯШВ
Fun fact is that Jaunpur distt ka population Agra & Gorakhpur distt se bhi jyada hai. But still GKP & AGC get more trains. ЁЯШВ