The town of Darjeeling can be reached by the 50 miles (80 km) long Darjeeling Himalayan Railway (nicknamed the "Toy Train") from Siliguri, or by the Hill Cart Road (National Highway 55) that follows the railway line. The Darjeeling Himalayan Railway is a 60 cm (2 ft) narrow-gauge railway. It was declared a World Heritage Site by UNESCO in 1999, becoming only the second railway in the world to have this honour. Regular bus services and hired vehicles connect Darjeeling with Siliguri and the neighbouring towns of Kurseong, Kalimpong and Gangtok. Four wheel drives, including Land Rovers, are the most popular means of transport, as they can easily navigate the steep slopes in the region. However, road and railway communications often get disrupted in the monsoons due to landslides. The nearest airport is in Bagdogra near Siliguri, located about 93 km (58 miles) from Darjeeling. Indian Airlines, Jet Airways and Air Deccan are the three major carriers that connect the area to Delhi, Calcutta and Guwahati. The closest major railway station is in New Jalpaiguri, which is connected with almost all major cities of the country. Within the town, people usually traverse by walking. Residents also use bicycle, two-wheelers and hired taxis for travelling short distances. The Darjeeling Ropeway, functional from 1968 to 2003, was stopped after an accident killed four tourists.