The Yatugatake Kogen Line, commonly referred to as the Koumi Line, is a single-track railway that connects the Chuo and Shinano services, traversing a picturesque route through Yamanashi and Nagano Prefectures. It holds the distinction of having the highest point reached by rail in Japan (1375 meters) and the highest railway station, making it a point of interest for railway enthusiasts and those seeking unique scenic experiences.
Visitors consistently praise the stunning natural beauty encountered along the route. Reviewers describe a journey through rugged mountains, alongside rivers and valleys, and past agricultural fields growing cabbage and shallots. The experience is often highlighted by the charm of the two-car diesel railcar, which many find 'cute' and fitting for the rural landscape. The line's unique geographical features, such as the highest railway point, are frequently mentioned as key attractions.
For a comfortable journey, it's advisable to check the weather conditions, especially during colder months, as the mountainous terrain can be prone to delays or suspensions. While the journey itself is the main attraction, bringing snacks and drinks is recommended as services on board or at smaller stations might be limited. The best time to visit would likely be during spring or autumn for pleasant weather and vibrant foliage, though summer offers lush green landscapes. Allow approximately 2-3 hours for a one-way trip, depending on your starting and ending points, to fully appreciate the scenery without feeling rushed.
The Koumi Line links directly with major railway services. Travelers can join from the Chuo Line at Kobuchizawa Station or connect from the Shinkansen (bullet train) at Sakudaira Station. These stations serve as convenient access points, making it relatively straightforward to integrate the Koumi Line into a broader rail itinerary. Public transport is the primary and most practical way to experience this line, as it is a train journey itself.
A common complaint among reviewers is the occasional unreliability of the service, with suspensions and delays occurring despite scheduled times. Travelers should be aware that while a fixed timetable exists, operational issues can arise, especially in a mountainous region. It is highly recommended to check the latest service updates and schedules before planning your trip, particularly if you have tight connections or time constraints. Building in some buffer time for transfers can help mitigate the impact of potential delays.
