18th & California and 18th & Stout are a pair of RTD light rail stations in Downtown Denver, Colorado, United States. Operating as part of the D, F and H Lines, the stations were opened on October 8, 1994, and are operated by the Regional Transportation District. These stations have one track each, and are one city block apart. 18th & California is served only by northbound trains and 18th & Stout is served only by southbound trains. This is a transfer point because after serving 18th & California, F and H Line trains turn around at 19th Street to serve 18th & Stout, while D Line trains continue to 30th & Downing via Welton Street before turning back to rejoin the main line.