Excellent question! This gets to the heart of how Tokyo’s complex transit system is organized. The key difference is that they are operated by different private railway companies with different primary purposes, routes, and business models.
Here’s a breakdown of the main differences:
Tokyo Monorail
- Primary Purpose & Route: An airport access line. Its core function is to connect Haneda Airport (Terminals 1, 2, 3) directly to Hamamatsucho Station in central Tokyo.
- Operator: Tokyo Monorail Co., Ltd., which is part of the JR East group.
- Key Characteristics:
- Route: A single, mostly elevated line running along the coast of Tokyo Bay.
- Transfer Point: At Hamamatsucho, you transfer to the JR Yamanote Line or Keihin-Tohoku Line to reach major hubs like Tokyo, Shinagawa, Shimbashi, and Shinjuku.
- Experience: Feels like a dedicated, modern airport express. It offers reserved seat “Haneda Express” cars for a premium.
- Fare: Slightly more expensive than Keikyu for the airport leg, but integrated with the JR network for through-ticketing.
Keikyu (Keihin Kyuko Railway)
- Primary Purpose & Route: A major private commuter railway network. While it serves Haneda Airport, its main system is a vast network serving commuters in southern Tokyo and Kanagawa Prefecture (cities like Yokohama, Kawasaki).
- Operator: Keik