Many Metro Projects are being pursued not on the actual needs but on the interest taken by State Govts/ Municipal Corporations. Cities with 30 lac population are generally considered large enough to have Metro Network. Allahabad has a low population and there are about 40 cities larger than Allahabad. Moreover Allahabad is also not growing a fast enough.
Population in lacs/year
Population in lacs-5.2----6.6----8.4----10.4---12.1---13.4
Census...
more... year-------1971--1981--1991--2001---2011---2017Est imated