The name “L00 Series” was chosen to spark a sense of anticipation for the journey ahead. The “L” represents three highlights along the route: Lions (baseball at Belluna Dome), Leisure (retro fun at Seibuen Yuenchi), and Lake (the natural scenery of Lake Tama). The “00” evokes the mathematical symbol “∞,” expressing the idea of infinite possibilities and memorable experiences along the line. Riding the L00 Series becomes a way to weave together these three unique elements and expand your trip with experiences that feel limitless.

The first train set, debuting in late March 2026, features a design inspired by the Saitama Seibu Lions. Dressed in the team’s signature colors, the train boosts the excitement of your journey even before you arrive at the stadium. For international travelers interested in Japanese sports culture, this “Running Lions” train is not to be missed.

Designs for the 2nd and 3rd trains (coming in 2026/2027) are highly anticipated. Seibu Railway aims to further elevate the excitement of customers heading to non-ordinary places like the Belluna Dome or the Seibuen Yuenchi (Amusement Park). Expect playful designs that treat the train itself as a "travel theme park." Discovering which design you encounter will be a fun surprise of your journey!

The L00 Series features significantly upgraded security to ensure a comfortable and worry-free ride. Each car is equipped with security cameras (two per car), along with side-view cameras, drive recorders, and platform detection devices — all designed to maintain Japan’s high safety standards. Train travelers in Japan can ride with confidence thanks to these thorough safety measures.

The L00 Series is designed for comfortable use by everyone. Wheelchair spaces are installed in every car, beneficial for travelers with large luggage. LCD information displays above the doors provide clear, multi-language route information. Plus, there are "Kids SEATs" and "Showcases" for unique in-train displays, enhancing the journey for families.

The Yamaguchi Line uses the "New Transit System" with rubber tires. This makes the ride exceptionally quiet and smooth compared to steel wheels. It minimizes vibration and takes curves effortlessly, offering a unique, amusement-park-like transport experience. Try this latest ride, packed with Japan's advanced technology!

Enjoy "Sports," "Leisure," and "Nature" in oOne dDay. The L00 Series connects a treasure trove of Japanese experiences. From Tokyo, you can efficiently enjoy three elements in a single day: Lions (Baseball viewing at Belluna Dome), Leisure (Retro Showa experience at Seibuen Amusement Park, and Lake (Nature walks at Lake Tama). The New Leo Liner L00 Series, which links this “"golden route” in Tokyo’s western suburbs", offers a new travel style where the time spent traveling becomes part of your cherished memories.

The L00 Series is scheduled to begin service in late March 2026, with the first train debuting in a Saitama Seibu Lions-inspired design. A total of three four-car sets will be introduced sequentially through 2027, bringing new comfort and character to the Yamaguchi Line. As this new chapter in travel gets underway, the L00 Series invites you to discover the infinite possibilities (∞) waiting along the route.