As on date there is no direct train from Bahraich(BRK) to Lucknow(LKO/LJN) or Gorakhpur(GKP) or Delhi(NDLS/DLI/NZM/ANVT). For Delhi nearest railway station is either Gonda(GD) or Sitapur(SCC).
A new line form Biswan(BVN) to Bahraich(BRK) would be ideal solution for many more train to and from Bahraich(BRK). Total 66.4Km of track would require with 2.8Km of bridge at Ghaghara river. Track can run parallel to 30B state highway.