Why 16859 train, chennai egmore manglore central express is running with a diesel loco from tiruchirapally to Manglore central and vice versa this route is already electrification is complited and the same electric locomotive that is from egmore that can continue till manglore central so that the use of diesel engines can be decrease and the engine changing should avoid it and also can save the time also in the same route karaikkal ernakulam express is running with electric locomotive till ernakulam and this train and manglore express are passing through the same route till palakkad jn