The line from Puerto Deseado, started in 1909, was built only as far as Las Heras, a distance of 283 km (176 mi), and a 197 km (122 mi) line from Comodoro Rivadavia to Sarmiento was completed. These lines came under the administration of Argentine State Railway in 1914. Meanwhile, the line from San Antonio Oeste, started at the end of 1908, reached Km 217 in 1911 and Maquinchao two years later. In 1916 this line also came under the administration of Ferrocarriles del Estado, was extended to Ingeniero Jacobacci in 1917 and to Bariloche in 1934.
When at mid 1930s the road transport became a serious competitor of rail transport, the EFEA acquired some railcars for the Patagonian railways (apart from other lines) to Hungarian company Ganz Works. The units were sent to serve the Carmen de Patagones–Bariloche line. The rolling stock arrived in Argentina in 1938, being operative since December that year.[2]