Newly introduced weekly Ernakulam-Patna Exp says goodbye to her home town Ernakulam behind a sparkling Arakkonam WAM 4 21255. The train has not been assigned a number so far and is simply referred to as 6309 A. 6309 is the earlier Ernakulam-Patna Exp running on Mondays while this new un numbered train runs on Tuesdays. Ernakulam Town, 2004-12-14. By Jimmy Jose.