The Putagán—Colbún railway, locally known as the Tren Chico (Small Train), was a 33 kilometres (21 mi) long[1] 600 mm (1 ft 11+5⁄8 in) narrow gauge railway that operated between the communities of Yerba Buenas and Colbún in the province of Linares in Chile.

Since the early twentieth century plans were made to build a railroad that would connect local communities in the province of Linares with the national rail network, especially the village of Panimávida[2] with its famous hot springs.

Construction finally started in 1910 and was finished in 1913.

On October 9, 1953, a serious accident occurred near Yerba Buena when a rural bus crashed into a train, leaving 22 people dead and many injured in one of Chile's worst train disasters ever.

[3] Due to this tragedy and road improvements between Panimávida and Yerba Buenas, with competition of minibuses and taxis as a result, operations finally ceased in 1956.