SWR do not have its own loco shed so it shares loco of either LGD or RPM/ED/AJJ
Kerala do not have its own loco shed so it shares loco from ED/RPM/AJJ but now condition will change
now Mangalore electrification is complete but still TSS is under construction.
Now only 3-4 trains are using Eloco up to MAQ AFAIK,but later pressure will increase on...
more... RPM/ED/AJJ.
Most of the trains from Kerala and Tamil Nadu via BZA use ED/RPM locos e.g. Kerala Express, Millennium, Rapti Sagar,Coimbatore-Jaipur Express,Duronto,Navjeevan,Himsagar and Navyug and many more.
When they reach to their destination,they take other train and go if no loco is available