The correct answer is: d) All of the above.
The Nilgiri Mountain Railway is a UNESCO World Heritage Site located in the Nilgiri Hills of southern India. It is a mountain railway that was built in the 19th century to connect the hill station of Ooty with the plains below. The railway is known for its scenic journey through the hills, its use of rack and pinion technology, and its steam locomotives.
The rack and pinion system is a type of railway track that uses a toothed rack to help the train climb steep hills. The rack is embedded in the middle of the track, and the train’s wheels have teeth that fit into the rack. This helps the train to grip the track and climb the hill.
The steam locomotives that are used on the Nilgiri Mountain Railway are also a major attraction. The locomotives are from the 19th century, and they are still in use today. They are a beautiful sight to see as they climb the hills, and they add to the charm of the railway.
The Nilgiri Mountain Railway is a popular tourist destination, and it is a great way to see the beautiful scenery of the Nilgiri Hills. It is also a great way to learn about the history of railway technology.