The Rijeka–Šapjane−State border railway, officially designated the M203 railway is a 30.9-kilometre (19.2 mi) long, single-tracked railway line in Croatia, which is operated by HŽ Infrastruktura.

[1] M203 connects Rijeka to the Slovene railway network north of Šapjane and to the Zagreb via M202 east of Rijeka.

[maps 1] It is electrified with 25 kV AC from Rijeka to Šapjane and 3 kV DC from Šapjane to the national border.

[2] The route was opened in 1873.

[3] Media related to Rijeka–Šapjane railway at Wikimedia Commons