The Nurdağı-Başpınar railway (Turkish: Nurdağı-Başpınar demiryolu) is a 56 km (35 mi) long electrified high-speed railway under construction in southern Turkey. Branching off the Fevzipaşa-Kurtalan railway at Nurdağı, the railway will connect to the Narlı-Karkamış railway at Başpınar, a northern suburb of Gaziantep. The railway is part of the larger Mersin-Adana-Gaziantep high-speed railway project, in which the existing Mersin-Adana and Adana-Bahçe railways are being upgraded to accommodate speeds between 160 km/h (99 mph) and 200 km/h (120 mph), along with the 17 km (11 mi) long Fevzipaşa bypass. When completed, the railway will accommodate mostly high-speed trains but also conventional passenger and freight trains and is classified as a high-standard railway (Turkish: Yüksek standartlı demiryolu).