Out of these, 12 pairs of special trains will ply between Santragachi and Chennai from January 10 to March 29, an SER spokesman said.
Another 13 pairs will run between Santragachi and Puducherry from January 6 to April 2, spokesman Sanjoy Ghosh said.
The 06057 Santragachi-Chennai Central Weekly Special leaving Santragachi at 11.50 pm every Thursday will reach Chennai Central at 05.30 am on Saturday.
In the opposite direction, the 06058 Chennai Central-Santragachi Weekly Special leaving Chennai Central at 3.15 pm every Wednesday will arrive at Santragachi at 7.00 pm the next day.