I don't why always they ignore a special train from Tambaram to Tiruvannamalai via CGL, VM . Now even there is double line available till VM. Always lazy SR do crap things.
Instead of conventional ICF rakes a MEMU/DEMU will be a good option. When operating DEMU as special from Chennai Egmore to Tirunelveli( i guess) recently why not a short distance is possible
Loco reversal not a big issue just for two days as special train easily they can do.