The MÁV Class 377 was the workhorse of Hungarian railways — one of the most widespread tank steam locomotives ever built, running for decades on secondary lines, private railways and industrial tracks across Hungary. Hundreds of these engines were produced, and remarkably, some remained in industrial service well into the decades after World War II.

For railway enthusiasts and technology history lovers, encountering one of these locomotives feels like stepping back into the late 19th century. Although inspired by the Austrian kkStB Class 97, every detail of the 377 was designed entirely on Hungarian plans by the MÁV Machine Works. Its outer frame construction, styled after the Wiener Neustadt Locomotive Works, gives it a distinctive, slightly archaic silhouette while remaining unmistakably Hungarian in character. Over the years these locomotives hauled freight and passenger trains on lesser lines, later becoming favored shunting engines at stations and in many industrial plants.

• Preserved examples and related exhibits can be found in Hungarian railway museums and heritage collections

• The first unit was completed in 1885; production continued until 1903, totaling 493 locomotives
• Renamed Class 377 in 1911
• Built by MÁV Gépgyár, StEG, the Wiener Neustadt Locomotive Works, Krauss of Linz, and the Weitzer works in Arad
• After WWI, many locomotives ended up in Romania (CFR), Czechoslovakia (ČSD) and Yugoslavia (SHS/JDŽ)

A fascinating detail: during World War I, thirteen of these locomotives were armored and used to power Hungarian armored trains — their simple mechanism and lack of air brakes made them surprisingly resilient in combat.