The Rainforest Ecological Train or Waterfalls Train (Tren Ecológico de la Selva or Tren de las Cataratas) is a 600 mm (1 ft 11+5⁄8 in) narrow gauge train that runs through the forest inside Iguazú National Park in the north of the province of Misiones of Argentina.

The line is 7 kilometres (4.3 mi) long and was built using rail track by French manufacturer Decauville.

[1][2] The train can transport up to 150 passengers over 7 kilometres (4.3 mi) of track from the Visitors’ Centre to Cataratas (Waterfalls) Station and Garganta del Diablo (Devil's Gorge) Station.

It is painted green and the propane-fired locomotive pulls up to five[3][4] opened-roofed carriages with wooden seats at the sides so that the passengers can view the forest.

From Garganta del Diablo (Devil's Gorge) Station visitors can go to a viewing platform built on the edge of the huge waterfall 90 metres (300 ft) high called Garganta del Diablo.