The Trans-Asia Rail Line is a high-speed rail line currently operating, connecting Seogyeong, Beijing, Shanghai and Saigon. Limited service is currently operating, using high-speed trainsets from Seogyeong to Nanning, and switching to diesel-electric locomotives to Saigon. Double-tracking to high-speed standards and electrification of the entire route is currently underway to allow high-speed service for the entire route.