Nurdağı–Başpınar railway

The existing 152 km (94 mi) long railway link between Nurdağı and Gaziantep was constructed between 1935 and 1953. Due to the policy shift for transportation in Turkey during the 1950s, the route was never upgraded to modern standards and follows a winding path that goes around the Sof Mountains, via Narlı, with an average transit time of around 2 hours and 30 minutes.[4] The Nurdağı-Başpınar railway will greatly shorten the route down to 56 km (35 mi) with a direct route through the Sof Mountains and track geometry to accommodate high-speeds.[5]

The western end of the railway begins just north Nurdağı station, where it branches east and roughly parallels the O-52 highway while crossing the Sağlık plain, until heading into the Sof Mountains, just south of the village of Şatırhüyük. The railway then traverses the Sof Mountains via four tunnels, the longest of them being over 7,000 m (23,000 ft) until reaching the existing railway just north of Gaziantep. The section after Başpınar, to central Gaziantep, was rebuilt and expanded to four-tracks between 2016 and 2022. Trains using the Nurdağı-Başpınar railway will then use the two south express tracks within Gaziantep, allowing segregation from slower commuter trains.