i partially agree with u. running via bhopal nagpur will certainly improve the speed as it is fully electrified route where an electric engine of 7000 hourse power will pull the train rather than diesel engine of 3100 hourse power. u can understand the from TVC to BSR it has an engine of 3100 hourse power, then has an engine of 7000 hourse power, now speed is obvisously more. however, i strongly support that KR is the best natural beautytrack and to travel via KR is like a dream come true.
however i suggest that mumbai rajdhani or august kranti can be extended upto madgao to cater the tourists traveling by train.
and...
more... turn TVC rajdhani via bhopal, nagpur bza, tpty, cbe ers tvc with an WAP 7 engine with great speed and good food. i is also shorter route that to with more speed, so we can reduce our journey by about 2 to 3 hours.