Turkish Wagon Industry, Inc., more commonly known as TÜVASAŞ, was a Turkish railcar manufacturer based in Adapazarı. TÜVASAŞ was responsible for the construction, refurbishment and repair of railcars for the Turkish State Railways (TCDD), of which it was a 100% shareholder,<[1] reporting directly to the Turkish Ministry of Transport.
The company was founded in 1951 as Vagon Tamir Atölyesi (Wagon Repair Shop) to repair existing railcars of TCDD's fleet.<[2] TÜVASAŞ became the largest railcar manufacturer in the Middle East. The headquarters were in the Adapazarı Plant in Mithatpaşa, a neighborhood of Adapazarı.
TÜVASAŞ and two other rail companies (TÜLOMSAŞ and TÜDEMSAŞ) merged under the umbrella of one company, TÜRASAŞ.<[3]