Which alignment bro?
See, Barauni to Katihar line is double line except Katreah Kursela from 4-5 years.
This line is from west to east direction so the north side line is used by down trains (going from BJU to KIR side) while the south side line is used by Up trains (going from KIR to BJU side).
But one train loco had fell from...
more... the north side line due to massive erosion sometimes in monsoon 2013, I think and then for precaution the above mentioned 20 km stretch north side line was not used as a precaution.
Now it has started.
I have no proof but during my journey in 2014 and 2016, I watch that down train changed track and operated on south side line in the section.
You can also get some clue by reading old blogs of these stations dating 2013/ 14.