From MTP, you can have trains via CBE to Madurai, Rameshwaram, Tutucorin, CAPE and Tenkasi. Also, one ONT to TVC via PGT, Ernakulam can be introduced on alternate days via Kottayam and via Alleppey.
If properly planned, one can have a train to Mumbai from MTP via CBE, SRR, MAQ and Konkan. This will connect Ooty to Kerala, coastal Karnataka, Goa and Konkan region. Will be a big hit also.
Trains to south originating from CBE towards PGT and POY can move to MTP and CBE can get new trains to SBC,...
more... HYB, UBL, TPTY, BZA, PDY, MV, VLNK, etc.