In Japan’s intricate rail hierarchy, a Rapid (Kaisoku) train is a service that skips some minor stations but usually doesn't require an extra surcharge beyond the basic fare. It sits between a "Local" train (which stops at every single station) and an "Express" or "Limited Express" train. Rapid trains are a great way to save time on regional travel without the high cost of a Shinkansen or Limited Express ticket. In 2026, you will also see Special Rapid (Shin-Kaisoku) trains, particularly in the Kansai region (Osaka/Kyoto/Kobe), which are incredibly fast and efficient, often rivaling the speed of express trains while still being covered by a standard IC card or JR Pass. While they are faster, they can also be more crowded during rush hour, as they are the preferred choice for commuters looking to bypass smaller residential stops.