The Košice Children's Heritage Railway (Slovak: Košická detská historická železnica, KDHŽ) is a 4.2 km (2.6 mi) long single-track heritage railway with a track gauge of 1,000 mm (3 ft 3+3⁄8 in).

Some rails, points and level crossings of the former narrow-gauge railway from Hronská Dúbrava to Banská Štiavnica, which was regauged to standard gauge in 1948-1949, were to be reused.

After completion and test rides of the first section between Čermeľ and Vpred stations, the steam locomotive U 35.104 Anička was inaugurated on 20 September 1955.

[1] p. 11 The rail bus U 36.004 initially operated on the line, until it returned to its original route on 16 October 1956, where it remained until its abolition in 1965.

In early 1983, the original Tatra 111 A engines were replaced by the newer Tatra 930 engines, after which their numbers changed to TU 29.2002 and TU 29.2003 and renamed Janka and Danka, after the twins of Maria Ďuríčková's book.

Due to the change in the numbering of rail vehicles in 1988, they were renumbered to as 701.952-4 (Janka) and 701.953-2 (Danka).

[1] p. 18, 27 A further reconstruction of the route took place between 1986 and 1987, when a large part of the tracks between the stations was exchanged.

[1] p. 18, 25 Due to the disappearance of the pioneering organization and stricter railway regulations, the operation of ČSD employees was taken over by ŽSR.

In 2012, the operation of the railway was taken over by the Košice Children's Railway Coalition, which wanted to revitalize the route and at the same time set a new cultural center in the framework of the Košice - European Capital of Culture 2013 project.

As a result, the official name changed again to Košická detská historická železnica (Košice Historical Children's Railway).

[5] The association was able to resume childcare services, extend the seasonal operation into late autumn and organize a series of cultural events that took place for the first time in 2012, such as the July Theater Saturdays, Summer Cinema or fall events.

[6][7] For the Nikolausfahrten 2012, which took place for the first time in the history of the railway, the diesel locomotive TU 29.2002 Janka was brought back on the track.

[8] The railway is currently running from the last weekend in April to the beginning of November, but traffic is expected to be extended throughout the year.

This happened after an unknown culprit had burnt down the ABC / u 600 car on 17 January 1993, but it could be reconstructed despite severe damage and has been used again since 1996 in the children's railway.

It was built in 1884 for the narrow gauge line from Gelnica via Mníšek nad Hnilcom to Smolník, where it operated until its abolition in 1965, with the exception of the period from 1938 to 1949, when she was running on the Hronská Breznica - Banská Štiavnica route.

Locomotive class ČKD 900 BS 200 Krutwig, which was mainly used in lignite mining and was located in the Museum of Old Machines in Žamberk,[10] was restored in 2016 and entered service as U 29.101.