The railway line from Budapest to Záhony via Szolnok, Debrecen and Nyíregyháza is Hungarian State Railways line 100. It is 335 kilometres (208 mi) in length and is a double-track main line with 25 kV/50 Hz electrification. The northern section, from Nyíregyháza to Záhony, is designated 100b.

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. ^[1]

The initial 98-km segment between Pest and Szolnok was built by the Magyar Középponti Vasút (Central Hungarian Railway) and opened on 1 September 1847. ^{[2] [3]} 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. ^[2] Since January 1855, the ownership and operations-right of the section Budapest–Szolnok had been obtained by the Imperial Royal Privileged Austrian State Railway Company (StEG) in the association with constructing the section Szeged– Temesvár. ^[4]

• Heinersdorff, Richard (1975). Die k. und k. privilegierten Eisenbahnen der österreichisch-ungarischen Monarchie 1828-1918 (in German). Wien / München: Molden. ISBN  3-217-00571-6.
• Strach, Hermann (1898). Geschichte der EIsenbahnen Oesterreich–Ungarns. Geschichte der Eisenbahnen der Österreichisch-Ungarischen Monarchie (in German). Vol. Band 1.1. Wien / Teschen / Leipzig: Karl Prochaska. pp. 73–503.

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