The South Western Railway zone came into existence on 1 April 2003 by bifurcating Mysuru and Bengaluru divisions from Southern Railway along with Hubballi division from South Central Railway. It is headquartered at Hubballi and comprises three divisions: Hubballi, Mysuru, and Bengaluru. The fourth division at Kalaburagi was slated to be the fourth division which was supposed to be carved out from Hubli, Secunderabad, Guntakal, and Solapur divisions. The divisional office at Kalaburagi is on hold due to operational constraints.