Longest railroad straight

For 478 km (297 miles) on the Nullarbor Plain the Trans-Australian line runs dead straight, although not level, from Mile 496 between Nurina and Loongana, Western Australia to Mile 793 between Ooldea and Watson, South Australia. Completed in 1917, this stretch of standard gauge railway crosses some of the most forbidding terrain in Australia. The word 'nullarbor' literally means 'no trees' and is a reflection of the lack of vegetation on this virtually uninhabited limestone plateau. In one year 712km (442 miles) of track were laid on the line, with 4km (2.5 miles) the most laid in one day (an Australian record). The Buenos Aires & Pacific Railway, Argentina, is dead straight and almost level for 330km (205 miles) between Junin and MacKenna on the 1676mm (5.49in) gauge line from Buenos Aires to Mendoza.