Tokyo Monorail Haneda Airport Line

Construction began in 1963, and the monorail opened on 17 September 1964, twenty-three days ahead of the opening ceremony of the 1964 Tokyo Olympics, for which it had been rushed into service. The initial line was 13.1 kilometres long, served only two stations — Hamamatsuchō and the airport (the original Haneda Station) — and ran almost entirely over open water along the Tokyo waterfront. It was Japan's first monorail built to the Alweg straddle-beam design, in which the cars sit astride and wrap around a single concrete guideway beam.

From the mid-1960s a series of infill stations was inserted along the original over-water alignment. Ōi Keibajō Mae, serving the Ōi racecourse, opened on 27 May 1965 as a temporary station and was made permanent on 1 June 1967. Haneda Seibijō Station, serving the airport maintenance district, opened on 20 March 1967. Shin-Heiwajima followed on 15 December 1969 and was renamed Ryūtsū Center on 8 January 1972. Shōwajima opened in 1985, upgraded from a signal post, and Tennōzu Isle was added on 19 June 1992, giving access to the developing waterfront district.

The early 1990s brought the line's first major rebuilding at the airport end. With the opening of a new passenger terminal — now Terminal 1 — the old Haneda Station and the 1.2-kilometre stub leading to it were closed on 26 September 1993, and the following day, 27 September, a new 5.1-kilometre alignment opened from the renamed Seibijō Station to the new airport terminal, relocating the route to serve the rebuilt Haneda Airport directly.

Further airport extensions followed as Haneda itself grew. A 0.9-kilometre extension to the then-new Terminal 2 opened on 1 December 2004, and at the same time the existing airport station was renamed Haneda Airport Terminal 1. A new infill station serving the international terminal opened on 21 October 2010; on the same day the route's name was formally changed to the Tokyo Monorail Haneda Airport Line. When Haneda's terminals were renumbered, the line's airport stations were renamed once more on 14 March 2020, the international terminal station becoming Haneda Airport Terminal 3 and the two domestic stations Terminals 1 and 2.

Ownership of the line passed to the JR East group at the turn of the century. In 2001 Hitachi Transport System transferred a 70-percent majority stake in the operating company to JR East and gave up management control, while Hitachi, Ltd. took a 30-percent holding; English-language sources date JR East's acquisition of the majority share to 2002. The company has since operated as a joint venture, and the monorail continues to provide one of the principal rail connections between central Tokyo and Haneda Airport.

• 1963Construction of the monorail begins.
• 196417 September: the Tokyo Monorail Haneda Line opens between Monorail Hamamatsuchō and the original Haneda Station, 23 days before the 1964 Tokyo Olympics; the initial 13.1 km line serves only two stations and runs almost entirely over open water.
• 196527 May: Ōi Keibajō Mae, the first infill station, opens as a temporary station serving the Ōi racecourse.
• 196720 March: Haneda Seibijō Station opens, serving the airport maintenance district; on 1 June, Ōi Keibajō Mae is made a permanent station.
• 196915 December: Shin-Heiwajima Station opens (later renamed Ryūtsū Center).
• 19728 January: Shin-Heiwajima Station is renamed Ryūtsū Center.
• 19857 February: Shōwajima Station opens, upgraded from a signal post.
• 199219 June: Tennōzu Isle Station opens, serving the developing waterfront district.
• 199326 September: the original Haneda Station and the 1.2 km stub to it close; 27 September: Haneda Seibijō is renamed Seibijō and a new 5.1 km alignment opens from there to the new airport terminal (now Terminal 1).
• 20041 December: a 0.9 km extension to the then-new Terminal 2 opens; the existing airport station is renamed Haneda Airport Terminal 1.
• 201021 October: a new infill station serving the international terminal opens; on the same day the route is formally renamed the Tokyo Monorail Haneda Airport Line.
• 202014 March: following Haneda's terminal renumbering, the airport stations are renamed — the international terminal becomes Haneda Airport Terminal 3, and the two domestic stations become Terminals 1 and 2.
• 2001Hitachi Transport System transfers a 70-percent majority stake in the operating company to JR East and gives up management control, while Hitachi, Ltd. takes a 30-percent holding (English-language sources date JR East's acquisition of the majority share to 2002).