In case of SR everything is good. But NR and WR are good zones because NR consist many Rajdhani's and Duronto's , many Superfast trains which provides connectivity from Delhi to some Neighbouring cities of state capital as well as provides some Few SF and Few premium trains to some poor cities to providng good connectivity to North part of India like Delhi, CDG ,DDN etc. And in case of western railways it provides fastest connectivity from South western India to Northern parts of india . As It provides route for Northbound trains from Pune and Konkan regions respectively.