Choosing to travel to Puerto Iguazu, to see the greatest waterfalls on the planet, the visitor would never imagine that he or she would have the chance to use a service thought to be the first of its kind in Argentina: the Waterfalls Train. The service started in July 2001, and has the advantage of being nature-friendly. It can transport 120 passengers over seven kilometers (nearly five miles) of track running along the river bank to near the Devil's Throat Fall, the most impressive of them all.

Built in England, in the workshops of the Alan Keeft company, in Ross-on-Wye, 200 kilometers to the west of London, the ecological train, painted all in green, consists of a gas locomotive pulling four roofed wagons with wooden seats that are completely open at the sides so that the passengers have direct contact with the forest.

The gas train was chosen to gain the following benefits:

• It avoids vehicles circulating and producing pollution from fuel waste, and thus does not damage the eco-system of the park.
• It gives the passengers greater contact with nature and they can appreciate the landscape from the open wagons.
• It reduces the collisions with animals that happen when a large number of vehicles are circulating. This is the main reason why the train never travels at a speed of over 20 kilometers per hour.

The train has three stations:

Central Station: here passengers take the trains going to the Waterfalls Station and the Throat Station. It has restrooms, a first-aid room, Park Ranger offices, and a commercial area consisting of a café and a kiosk.

Waterfalls Station: the pathways to the Lower and Upper Circuits and the Green Path start and come together here. It works as a kind of distribution center with a square, a lounge area, fast food services and restrooms.

Devil's Throat Station: from here there is direct access to the Devil's Throat walkway, which reaches the new balconies built over the edge of the huge waterfall, at 90 meters height. It has a square, restrooms and a fast food store. There the Iguazu River crashes among the rocks and the dense aquatic vegetation, where swifts, birds of the swallow family whose trilling song is an exciting part of the landscape, choose to nest.