The famous narrow-gauge Nilgiri Blue Mountain Railway climbs up from Mettupalayam on the plains, via Hillgrove (17km) and Coonoor (27km) to Udhagamandalam, a journey of 46km that passes through sixteen tunnels, eleven stations and nineteen bridges. It’s a slow haul of four and a half hours or more – sometimes the train moves little faster than walking pace, and always takes at least twice as long as the bus – but the views are absolutely magnificent, especially along the steepest sections in the Hulikal ravine.

The line was built between 1890 and 1908, paid for by the tea-planters and other British inhabitants of the Nilgiris. It differs from India’s two comparable narrow-gauge lines, to Darjeeling and Shimla, for its use of the so-called Swiss rack system, by means of which the tiny locomotives are able to climb gradients of up to 1 in 12.5. Special bars were set between the track rails to form a ladder, which cogs of teeth, connected to the train’s driving wheels, engage like a zip mechanism. Because of this novel design, only the original locomotives can still run the steepest stretches of line, which is why the section between Mettupalayam and Coonoor has remained one of South Asia’s last functioning steam routes. The chuffing and whistle screeches of the tiny train, echoing across the valleys as it pushes its blue-and-cream carriages up to Coonoor (where a diesel locomotive takes over) rank among the most romantic sounds of south India, conjuring up the determined gentility of the Raj era. Even if you don’t count yourself as a trainspotter, a boneshaking ride on the Blue Mountain Railway should be a priority.

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