NOHAB

NOHAB
Name	NOHAB
Native name	Nydqvist & Holm AB
Founded	1847
Defunct	1979 (industrial operations)
Headquarters	Trollhättan, Sweden
Industry	Machinery, Locomotive manufacturing, Turbines
Products	Locomotives, Diesel engines, Turbogenerators, Ship engines, Hydropower equipment

NOHAB

NOHAB was a Swedish heavy engineering firm founded in Trollhättan that became prominent for locomotive construction, diesel engines, and industrial machinery during the 19th and 20th centuries. The company interacted with major European railways and shipyards and played roles alongside manufacturers and institutions such as SNCF, British Rail, General Electric, Sulzer, and Siemens. Its facilities and designs influenced projects involving firms like Vickers, Mannesmann, AEG, Alstom, and Bayerische Motoren Werke.

History

NOHAB originated in the mid-19th century when engineers with connections to Emanuel Nobel-era industry and Swedish industrialists established workshops in Trollhättan near the Göta älv and the Trollhättan Falls. Early contracts involved collaboration with Swedish state railways and municipal authorities in Stockholm, Gothenburg, and Malmö, and interactions with Scottish and English firms like North British Locomotive Company and Robert Stephenson and Company. Through the late 19th century NOHAB built steam locomotives for the Grand Duchy of Baden State Railway and delivered marine engines to yards in Belfast and Clydebank. In the interwar and postwar period NOHAB diversified into diesel traction and turbine technology, engaging with companies such as Wärtsilä, MAN, Babcock & Wilcox, and Allis-Chalmers. Cold War era procurement connected NOHAB to clients in Yugoslavia, Egypt, and Ethiopia, while corporate restructuring in the 1960s and 1970s saw ties to SKF, Electrolux, and ASEA. Industrial decline and shifts toward multinational mergers culminated in cessation of main manufacturing activities by 1979 and later repurposing of the Trollhättan works by firms including ABB and GKN.

Products and Technologies

NOHAB produced steam locomotives, diesel locomotives, medium-speed diesel engines, turbogenerators, and pumps. Diesel designs incorporated licensed technology and partnerships with GM-EMD, Sulzer Brothers, Sulzer diesel, and Bristol Siddeley auxiliaries, while turbine work referenced collaborations with Brown Boveri and Siemens-Schuckert. Ship propulsion systems were provided to yards such as Harland and Wolff and Blohm+Voss, and NOHAB manufactured hydroelectric machinery for projects with firms like Siemens Energy and Voith. Control equipment and electrical switching related to NOHAB output invoked suppliers including BBC and Westinghouse Electric Company. Research interactions included universities and institutes such as KTH Royal Institute of Technology, Chalmers University of Technology, and the Swedish National Defence Research Institute.

International Operations and Exports

NOHAB exported locomotives and engines across Europe, Africa, and the Americas. Major export customers included the Hungarian State Railways, Bulgarian State Railways, Greek Railways (OSE), Portuguese Railways (CP), and Scandinavian operators like Norges Statsbaner and Danske Statsbaner. Contracts extended to South America with deliveries to Argentina and Chile railways, and to the Middle East with orders from Iran and Iraq. Strategic export relationships tied NOHAB to licensing and joint ventures with General Motors, English Electric, and Cravens, while maintenance and overhaul programs engaged workshops in Belgium, Netherlands, Romania, and Poland. Cold War geopolitics influenced sales to non-aligned states such as India and Egypt and facilitated technology exchange with firms in Czechoslovakia and Hungary.

Corporate Structure and Ownership

NOHAB’s corporate governance evolved from family ownership to complex holdings involving Swedish and international capital. Early board members included industrialists connected to Svenska Handelsbanken and regional patrons from Västra Götaland County. Later ownership stakes involved conglomerates and banks like SKF, Electrolux, Société Générale, and industrial investors from Germany and France. Strategic alliances with Babcock & Wilcox, AEG, and Vesuvius influenced technology transfers and capital arrangements. During restructuring, assets were sold to firms including ABB, GKN, and regional development agencies coordinated with the Swedish Agency for Economic and Regional Growth.

Notable Projects and Rolling Stock

NOHAB-built locomotives and projects included passenger and freight diesel classes widely used in Europe. Famous classes and clients included the diesel-electric locomotives delivered to Hungarian State Railways (M61 series), to Danish State Railways (MY/MZ families), and to operators such as Presidente Perón-era Argentine railways and Portuguese Railways (CP). NOHAB supplied turbogenerators and turbine sets for hydroelectric schemes associated with Vattenfall projects and collaborated on marine installations for Kockums and Meyer Werft. Rolling stock refurbishment and export refurbishment programs tied NOHAB to workshops in Hamar, Skopje, and Valencia.

Legacy and Preservation

NOHAB’s industrial heritage persists in preserved locomotives, museum exhibits, and surviving works complexes in Trollhättan. Preserved examples operate in heritage fleets maintained by organizations such as Swedish Railway Museum, Hungarian Railway History Park, Danish Railway Museum, and private groups like Rail4Chem and Railcare. The Trollhättan workssite and associated buildings are subjects of local conservation efforts linked to Trollhättan Municipality and cultural institutions including Nordic Museum initiatives. Academic studies and industrial histories referencing NOHAB appear in publications from KTH, Chalmers, Lund University, and EU-funded regional industrial archaeology programs.

Category:Defunct companies of Sweden