They call it in Argentina "The Ecological Train"
. Brought from England, the train was designed especially for this area, it´s open cabins runs by natural gas.
The train speed limit inside the park is 20 km per hour giving people opportunity to take pictures and appreciate the environment.
Inside the park there are three stations, Estacion Central (at the entrance of the park), Estacion Cataratas (leading to superior and lower trails) and Estacion Garganta del Diablo (leading to the brink of the Devils Throat). If the train is very busy there is a way to reach Devils Throat by foot.