Yes Anvit sir, crew change can be done like this
For Mumbai to Hyd
Mumbai/pune/Gulbarga/Hyderabad-- Slack time if any can be reduced and trains can be speeded up by atleast 30minutes once doubling and electrification is completed.
For Mumbai-Chennai
Mumbai/Pune/Gulbarga/Guntakal/Renigunta/Chennai--...
more... Slack time in this route is very huge and trains can now also speeded up by atleast 30-40 minutes easily
For Mumbai-Bangalore
Mumbai/Pune/Gulbarga/Guntakal/Bangalore-- Even Dharmavaram point can be removed for some SF trains ...