Line 18 (Beijing Subway)
Line 18 or Line R1 of the Beijing Subway is a rapid transit line under planning in Beijing.History
In January 2011, the R1 Line was described by the Tongzhou District leadership as a line that would run parallel to Line 1 which would be built before 2015. The line was named in February 2012 as one of six new lines under planning by the city's public transit planning authorities.