The ACsEV (Aradi és Csanádi Egyesült Vasutak, En.: Arad & Csanad United Railways) were a Hungarian joint-stock railway company. Till 1920, the network had a length of 391 km. Since 1903, the company bought more than forty petrol-electric self-propelled rail cars, and thus for some years performed one of the most advanced passenger transports in the world. Due to changes of the borders, in 1920 more than half of the company's network was taken over by the Romanian Railways (CFR).