Brown Line may refer to: Brown line, a process defined as siderotype, a monochrome printing process Brown Line (CTA), Chicago Brown Line (Delhi Metro), Delhi, India 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 Paris Métro Line 11, Paris, France Thomson–East Coast line, Singapore Tuen Ma line, Hong Kong, China U5 (Berlin U-Bahn), Berlin, Germany Wenhu line, Taipei, Taiwan