There are a lot of other routes
Like bui/bsb/Gct trains towards Delhi can run via ayodhya-Gonda-scc
Trains from Patna to Delhi can run via ppta-gkp-scc
Trains from Patna towards ald can run via ppta-cpr-bsb.
IR...
more... is not utilizing alternative routes so please
Don't give foolish explanations.