Yerevan Children's railway, Children's railway in Yerevan, Armenia

Yerevan Children's railway is a 2.1 km narrow-gauge line in the Hrazdan Gorge, with stations Hayrenik, Pionerakan and a Urakhutyun platform, plus a 45 m tunnel. Its train is a small yellow, red and blue diesel locomotive hauling three low, open-sided cars banded in red, yellow, green and blue, parked on gravel beside a stone retaining wall.

Babken Amatuni and Aghasi Khanjian proposed a children's railway in 1935, and on 22 April 1936 they laid its foundation stone in the park, where the Paros station later renamed Hayrenik was built. The line opened on 6 July 1937, ahead of the planned November date, with a 159-434 steam locomotive and three open wooden cars. Architect Mikayel Mazmanyan designed the park and its first wooden station; in the late 1940s Babken S. Hakobyan replaced it in stone, and Gohar Grigoryan designed the last station building.

The railway stations carry names reflecting homeland and pioneer spirit, rooted in Soviet educational traditions where children learned about rail work and transportation. Families still gather here today, making it a place where generations experience their first train ride and adults enjoy time in nature.

The line runs in the Hrazdan Gorge, reached on foot through a tunnel from Yerevan's main avenue or in summer via an open-air train from near the Yeghishe Charents House-Museum. Trains leave as they fill rather than on a timetable, and the ride ends at the closed Pionerskaya station, where passengers stay aboard while the train reverses back to Hayrenik.

The 1937 steam locomotive 159-434, built at the Podolsk plant, is no longer in service and stands in a dead end at Hayrenik station; it is considered the oldest steam locomotive in Armenia. The train running today is hauled by the diesel locomotive TU2-096, built in 1957 at the Kaluga machine-building plant.