You want to run a train from A to B via C,. But C rejects it. D comes up saying, you can go via our tracks. This is what has happened.
You: SCR
A: KCG B: MAQ
C: SWR and D: SR
SWR...
more... constrains is Ghats. Single line Ghats, they don't want to increase traffic.
If you look in SCR perspective, the might have lost shortest route, but got high revenue stations like ED,SA,CBE,PGT,SRR, which always had good patronage to Hyderabad. Naturally, SCR would have said yes to SR, since something is better than nothing.