In the last few years the amount of trains from East/North towards South has increased a lot ( a reflection of the general trend of migration in the country) . However the same cannot be seen in West South sectors or even intra zone/intra state trains in SR. One view which seems to have come out is there is limited infra especially with regard to pit lines/stabling lines in many SR stations . While many long distance trains arriving in South have seen a increase in speed due to ZBTT , there is still further scope for speed up which is not being accepted by many divisions due to various factors like PF availability, limited infra in stabling lines, pit lines etc