The correct answer is Granite stone.

• In 1835, a short railway line intended to carry granite stone was laid at Chintadripet on an experimental basis.
• It later became known as the Red Hill Railroad line.
• The Madras Railway was formed in 1845.
• In 1852, the work for laying the first track by Madras Guaranteed Railway Company between Madras and Arcot was started
• Its first track from Royapuram in Chennai to Arcot was opened in 1856.
• The first railway station in Madras city was opened at Royapuram in 1853.
• It was the first to be constructed railway station in South India.

• Evolution of Indian railway:
  • The first railway on the Indian sub-continent ran over a stretch of 21 miles from Bombay to Thane.
  • The idea of a railway to connect Bombay with Thane, Kalyan, and with the Thal and Bhore Ghats inclines first occurred to Mr. George Clark, the Chief Engineer of the Bombay Government, during a visit to Bhandup in 1843.
  • The formal inauguration ceremony was performed on 16th April 1853.
  • The first train had 14 railway carriages and carried about 400 guests.
  •  It was operated by three locomotives, named Sahib, Sultan, and Sindh