Rail gauge in Slovakia. The track gauge for most lines in Slovakia is the international standard gauge of 1,435 mm (4 ft 8+1⁄2 in).

Two lines connecting to Ukraine are "Russian broad gauge", 1,520 mm (4 ft 11+27⁄32 in):

• Uzhhorod–Košice broad-gauge track (Užhorod–Maťovce–Haniska pri Košiciach),
• Čop–Dobrá pri Čiernej nad Tisou.

On 25 November 2008, a tripartite memorandum of understanding was signed between Russia, Ukraine, and Slovakia on the construction of a broad-gauge line to the Austrian border. On 30 April 2009, Austrian chancellor Werner Faymann announced that his government politically supports the construction of a broad-gauge line from the Austro-Slovak border to Vienna. In November 2010, the Slovak Prime Minister Iveta Radičová announced the Slovak government will not support the project, as it threatens the Slovak workplaces in the Dobrá bulk terminal, which would be unnecessary after the completion of the project.^[1]

• Tatra Electrical Railways / Tatranské elektrické železnice (TEŽ) – 1,000 mm (3 ft 3+3⁄8 in)
  • Poprad-Tatry–Starý Smokovec–Štrbské Pleso
  • Tatranská Lomnica–Starý Smokovec
  • Štrbské Pleso–Štrba rack railway
• Košice Children's Heritage Railway / Košická detská historická železnica (KDHŽ) – 1,000 mm (3 ft 3+3⁄8 in)
  • Čermeľ–Alpínka

• Trenčianske Teplice' Electrical Railway / Trenčianskoteplická elektrická železnica (TREŽ) – 760 mm (2 ft 5+15⁄16 in)
  • Trenčianske Teplice–Trenčianska Teplá
• Čierny Hron River Railway / Čiernohronská železnica (ČHŽ) – 760 mm (2 ft 5+15⁄16 in)
  • Vydrovo dolina–Čierny Balog–Hronec–Chvatimech
• Orava-Kysuce Forrest Railway / Oravsko-kysucká lesná železnica (OKLŽ or HLÚŽ) – 760 mm (2 ft 5+15⁄16 in)
• Agricultural Museum Railway in Nitra – 760 mm (2 ft 5+15⁄16 in)
• Váh' River Forrest Railway / Považská lesná železnica (PLŽ) – 760 mm (2 ft 5+15⁄16 in)
  • Pribylina

• Rail transport in Slovakia