Why don't they upgrade alternative routes? Bsb-lko-mb (all 3 routes) and bsb-ucr-cnb section can be upgraded as alternative for ddu-gzb line. A simple bypass at chunar will provide alternative for pcoi-sta-kte line. Kasganj-aligarh new line will make an altogether new route to gzb via ddu-ucr-cnb-ksj-aljn. But IR just won't utilise the alternate routes and would rather run trains on the already oversaturated ddu-pryj-cnb-aljn line.