Train shedule at a railway station in Colombo. The Railway Network was introduced by the British in 1864 and 1st train ran on 27th December 1864, with the construction of the Main Line from Colombo to Ambepussa, 54 kilometers to the east. The Sri Lankan rail network is 1,508 km (937 mi) of 5 ft 6 in (1,676 mm) broad gauge. Some of its routes are scenic, with the main line passing (or crossing) waterfalls, mountains, tea estates, pine forests, bridges and peak stations. Sri Lanka.