In November 1903, a steam engine called the &lsquoHill Puffer&rsquo chugged out of Kalka with the viceroy, Lord Curzon on board. Seven hour later, after passing through 109 tunnels (the longest, at Barog, being nearly a kilometer long), crossing 969 bridges, 919 curves and passing 20 railway station it pulled into Shimla, the summer capital of British India.
The Kalka-Shimla toy train had climbed more than 4,800 feet over a distance of 96 km, bringing Shimla within easy reach of travelers from the plains.