Mirsk–Świeradów Nadleśnictwo railway

Mirsk–Świeradów Nadleśnictwo railway (before 1945 known as the Isergebirgsbahn or Izera Mountains Railway) was a single-track, non-electrified railway line with a length of 11.011 km, which connected Mirsk railway station with Świeradów Nadleśnictwo railway station. The line was located in the Lower Silesian Voivodeship, within the counties of Lwówek (Gmina Mirsk) and Lubań (town of Świeradów-Zdrój).

The construction of the line was initiated by private interests. The first work began in 1908, and regular operations on the Mirsk–Świeradów-Zdrój section started on 31 October 1909. The section to Świeradów Nadleśnictwo was opened for regular use on 10 June 1910. The newly built route was initially a narrow-gauge railway with a track gauge of 600 mm, which was later converted to standard gauge after a few years. After World War II, the line was taken over by Polish State Railways, and the first train ran on 18 December 1946 after the bridge over the Kwisa river was rebuilt. The section from Świeradów-Zdrój to Świeradów Nadleśnictwo was scheduled for closure on 15 December 1995. The last passenger train departed from Świeradów-Zdrój railway station on 11 February 1996, but freight traffic continued for another two years.

Between 2021 and 2023, the former Izera Mountains Railway, along with the section No. 317 from Gryfów Śląski to Mirsk, was revitalized, and regular passenger services were inaugurated on 10 December 2023. Since then, the entire route from Gryfów Śląski to Mirsk and Świeradów-Zdrój has been designated as Gryfów Śląski–Świeradów-Zdrój railway.