The B Line, also known as the Northwest Rail Line during construction, is a commuter rail line which is part of the commuter and light rail system operated by the Regional Transportation District in the Denver metropolitan area in Colorado. Part of the FasTracks project, the first 6.2-mile (10 km) section from downtown Denver to south Westminster opened on July 25, 2016. If fully built out, estimated around 2042, the B Line will be a 41-mile (66 km) high-capacity route from Denver Union Station to Longmont, passing through North Denver, Adams County, Westminster, Broomfield, Louisville and Boulder.
B Line train at Westminster Station
RTD bus and rail services
RTD Bus and Rail is a transit system in the Denver, Colorado, metropolitan area. Operated by the Regional Transportation District (RTD), it currently runs 86 local, 23 regional, 14 limited, and 3 skyRide bus routes plus some special services. It also includes 6 light rail lines and an additional 4 commuter rail lines with 77 stations and 113.1 miles (182.0 km) of track.
RTD's three modes of public transit
Image: RTD No. 4018 A Line train, USTH
Image: Denver LR Vs in snow, on Stout St in downtown
Littleton-Mineral light rail station