The correct answer is: A. 1911
The Kalka-Shimla Railway is a narrow-gauge mountain railway in India. It is a UNESCO World Heritage Site and one of the most popular tourist destinations in India. The railway was built between 1898 and 1903 and is one of the steepest railways in the world. It has 96 tunnels and 107 bridges, and climbs 2,000 feet (610 m) in 86 miles (138 km).
The railway was originally powered by steam locomotives, but these were replaced by petrol rail cars in 1911. The petrol rail cars are smaller and lighter than steam locomotives, and they are better able to negotiate the steep gradients of the railway. They are also more efficient, and they produce less pollution.
The petrol rail cars are a popular way to travel between Kalka and Shimla. They are comfortable and scenic, and they offer a unique way to experience the beauty of the Himalayas.
Here is a brief explanation of each option:
- Option A: 1911. This is the correct answer. The petrol rail cars were introduced on the Kalka-Shimla Railway in 1911.
- Option B: 1913. This is incorrect. The petrol rail cars were introduced on the Kalka-Shimla Railway in 1911, not 1913.
- Option C: 1918. This is incorrect. The petrol rail cars were introduced on the Kalka-Shimla Railway in 1911, not 1918.
- Option D: 1917. This is incorrect. The petrol rail cars were introduced on the Kalka-Shimla Railway in 1911, not 1917.