The train normally runs with three coaches, accommodating 146 persons.
To facilitate more passengers to tide over extra summer rush, the railway authorities decided to add one more coach, which can accommodate 60 additional passengers, till May 15, railway sources said.
Depending on the patronage and feasibility, the train will run with four coaches in future, they said.
There was huge demand from the public and tourists to run one special train during the summer season, when more number of people visit Nilgiris District, a hilly district, having major tourist spots.