In 1906 the BAGS proposed an extension of the line from Zapala, 115 km from the Chilean border, across the Andes to the town of Lonquimay in Chile. Due to lack of funds the line was never built. This would have provided a rail link between the two countries in addition to the Transandine Railway, connecting Mendoza in Argentina with Los Andes in Chile, which was opened in 1910.