Rail transport in Latvia is done on 1,520 mm (4 ft 11 27⁄32 in) Russian gauge. The main railway company is Latvijas dzelzceļš.
Historically Latvia had lot of different rail gauges, most notably 1,435 mm (4 ft 8 1⁄2 in) standard gauge and 750 mm (2 ft 5 1⁄2 in) narrow gauge.
References
Rail transport in Latvia Wikipedia(Text) CC BY-SA