Show HN: Public transit systems as data – lines, stations, railcars, and history

The Light RailLink is a light rail system operated by the Maryland Transit Administration serving the Baltimore metropolitan area. Running 30 miles from Hunt Valley in northern Baltimore County through downtown Baltimore to Cromwell Station/Glen Burnie and BWI Airport in Anne Arundel County, it is one of the oldest modern light rail systems in the eastern United States. The system uses former railroad rights-of-way for much of its route and runs as a street-running railway through downtown on Howard Street.

The Metro SubwayLink is a heavy rail rapid transit line operated by the Maryland Transit Administration serving the Baltimore metropolitan area. Running 15.4 miles from Owings Mills in Baltimore County through downtown Baltimore to Johns Hopkins Hospital in East Baltimore, it is the only rapid transit line in Maryland. The system features both surface and deep-bore tunnel sections, with six underground stations in the downtown core.

BART is a heavy rail rapid transit system serving the San Francisco Bay Area in California. It connects San Francisco, Oakland, Berkeley, and surrounding East Bay cities with lines extending to San Francisco International Airport and the Silicon Valley.

The Beijing Subway is a rapid transit system serving Beijing, China. It is the world's busiest and one of the longest metro systems, having surpassed Shanghai in total length in 2023. Originally opened in 1969 as China's first subway, it has undergone massive expansion, particularly after Beijing won the 2008 Olympics bid.

The Chicago 'L' is the rapid transit system serving the city of Chicago and some of its surrounding suburbs. Operated by the CTA, it is the fourth-largest rapid transit system in the United States by ridership. The system's name comes from the elevated railways that make up much of the network, though portions also run in subway tunnels, at grade, and in highway medians.

The New York City Subway is the largest rapid transit system in the world by number of stations, operating 472 stations across four boroughs of New York City. Opened in 1904 and serving approximately 3.6 million riders daily, it is one of the few transit systems in the world that operates 24 hours a day, 7 days a week, forming the backbone of transportation in the most densely populated major city in the United States.

Sound Transit operates regional express bus, light rail, and commuter rail services in the central Puget Sound region of Washington state. The Link light rail system connects Seattle, Bellevue, and surrounding communities.

Tokyo Metro is one of two rapid transit operators in Tokyo, Japan (the other being Toei Subway). Originally opened in 1927 as Asia's first subway, it was privatized in 2004 from the Teito Rapid Transit Authority (TRTA/Eidan). Tokyo Metro is the busiest metro system in the world by annual ridership.

The Washington Metro, operated by WMATA, is the rapid transit system serving the Washington metropolitan area. It is the second-busiest rapid transit system in the United States and serves the District of Columbia, along with portions of Maryland and Virginia.