For your kind information :
.
Itarsi to Pune (normal Straight route Via Khandwa- Bhusaval- Manmad) = 805 KMs.
Itarsi to Pune (via Nagpur & Manmad) = 1407 KMs
Difference = 1407-805 ~= 600 extra...
more... distance.
so, Is Railway earning extra money for these 600 KMs ?