 The second line was to have branches to Comodoro Rivadavia, via Sarmiento, to Colonia 16 de Octubre and to Buenos Aires Lake.The line from Puerto Deseado, started in 1909, was built only as far as Las Heras, a distance of , and a line from Comodoro Rivadavia to Sarmiento was completed.These lines came under the administration of Argentine State Railway in 1914.