The Metro Rail Transit Line 8, or MRT-8, also known as PNR East-West Line, is a proposed rapid transit line in the Philippines. It would be a 9-kilometer (5.6 mi) railway system connecting Sampaloc, Manila and Diliman, Quezon City via Commonwealth Avenue, Quezon Avenue, and España Boulevard. The railway line was formerly designated as MRT-9, which has since been designated to the Metro Manila Subway)