Here is a list of the stations having the highest number of trains in Bihar (up/down trains which halt or originate from that station)..
1)PNBE:- 219 trains
2)BJU:- 170 trains
3)SPJ :- 152 trains
4)CPR:-...
more... 145 trains
5)GAYA:- 144 trains
6)KNE:- 142 trains
7)HJP:-- 133 trains
8)MFP:- 126 trqins
9)KIR :- 104 trains
9DBg:- 72 trains
10:-bgp :- 65 trains