I had recently travelled from Shegaon to Nagpur and was waiting for my train Sevagaram Express. Meanwhile I was tracking the train and found that CSTM-HWH Durant overtook sevagram some station. Obviously Duronto with great speed crossed SEG with WAP4. And within 10 mins Sevagram came with WAP7. That means a WAP4 hauled train overtakes a WAP7 train.
Then why give trains like Sevagram WAP7. Do you know any other situations where trains with WAP/WDM/p overtakes a higher capacity loco like WAP 5/7?