Brown Line may refer to: Brown line, a process defined as siderotype, a monochrome printing process Brown Line (Bangkok), Thailand Brown Line (CTA), Chicago Brown Line (Delhi Metro), Delhi, India Brown Line (Mexico City Metro), Mexico Brown Line (Pittsburgh), Pittsburgh, Pennsylvania Bakerloo line, London, United Kingdom BMT Nassau Street Line, a rapid transit line in New York City J/Z (New York City Subway service) Tangerang Line of KRL Commuterline, Jakarta, Indonesia Line 18 (São Paulo Metro), São Paulo, Brazil Paris Metro Line 11, Paris, France Thomson–East Coast Line, Singapore Ma On Shan line, Hong Kong, China Tuen Ma line, Hong Kong, China U5 (Berlin U-Bahn), Berlin, Germany Wenhu line, Taipei, Taiwan Copper Line (San Diego Trolley), San Diego, California Metro Bronze Line (Minnesota), Minneapolis–Saint Paul, Minnesota