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The railway line from Szolnok to Záhony via Debrecen and Nyíregyháza is Hungarian State Railways line 100. It is 236 kilometres (147 mi) in length and is a double-track main line with 25kV/50Hz electrification. The northern section, from Nyíregyháza to Záhony, is designated 100b.
The initial 100-km segment between Cegléd and Szolnok was built by the Magyar Középponti Vasút (Central Hungarian Railway) and opened on 1 September 1847. Construction was interrupted by the 1848-49 war of independence and was resumed by the newly formed Tiszavidéki Vasút (Theiss Railway). The Szolnok - Debrecen segment opened on 25 November 1857 and the segment from Debrecen to Miskolc via Nyíregyháza on 24 May 1859.
From Szolnok there is a rail connection to Budapest. The Szolnok - Záhony line has become known for the so-called Fekete vonat (black train) which brings labourers to the capital and has been the scene of fights.