The Irmak–Zonguldak railway () is a railway line in the Black Sea Region of Turkey. The railway connects the industrial coal regions and the port of Zonguldak as well as the Kardemir steel mill to central Anatolia and is a major freight railway. Due to the importance the railway has on the Turkish coal industry, it has been nicknamed the coal-route ().Irmak-Zonguldak railway history - trainsofturkey.com The railway was built by the Turkish State Railways in 1937. A thrice-weekly passenger train, the Karaelmas Express, ran from Ankara to Zonguldak but was discontinued on 1 January 2010.Karaelmas Ekspresi - ekşi sözlük In 2014, regional passenger service was brought back between Zonguldak and Filyos but the line today is mainly for freight rail.
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