Mumbai to Delhi (1385 kms) many trains cover the distance in 17-18 hours . But Mumbai to Chennai (1200 kms) takes 22 hours. Mumbai to Bangalore (1100 kms) takes 24 hours!!!.
Is there any benefit of these upgradation jobs?? Anyway journey time is going to be almost same, thanks to bus operators. We may get some 5-10 minutes saving which will get projected as a big news. That's all.