Singrauli and sonbhadra is way bigger than the places you mentioned and any major city is minimum 200 km Varanasi (8hours), 300km prayagraj (10hrs), 350km jabalpur (10-12hrs). Also buses are very difficult due to hilly region and travel time is also more than other places.
Also, every zone ECR,ECR,NCR earning very high from our region without any passanger amenities.
Also...
more... everyone has the right to ask for trains, you can also demand.... I don't have any problem