SJ AB is a Swedish railway company that operates passenger train services across Sweden. Founded in 2001, it is a state-owned enterprise and is known for providing comfortable and efficient travel options. SJ AB offers various train types, including high-speed trains, regional services, and night trains, catering to different travel needs. The company focuses on sustainability and aims to reduce its environmental impact by promoting train travel as a greener alternative to cars and planes. SJ AB also provides services such as online ticket booking and real-time travel information, enhancing the overall travel experience for its customers.