Jun 30, 2025 (News On Japan) - Recent reports have confirmed that 5G speeds on Tokyo’s busiest railway lines drop by nearly one-third during rush hour.
Large numbers of commuting passengers daily in major stations such as Shinjuku, Ikebukuro, and Tokyo Station put the mobile infrastructure in the city under tremendous pressure, with millions of commuters entering and exiting a single station daily.
The problem boils down to congestion of the networks. Bandwidth gets thin when too many individuals attempt to access the same cell towers simultaneously, particularly when there are crowded train cars. This can lead to significantly slower download speeds, longer page loads, and patchy performance, especially at the peak morning and evening hours.
Even Tokyo mobile network, with its state-of-the-art infrastructure, can become overwhelmed at these locations in places that promise to deliver fast downloads, low latency, and network stability under 5G conditions.
Mobile users in Tokyo make full use of their 5G connections on the go. It’s common to see commuters watching short videos, scrolling through social media, or playing games to pass the time. Among these digital pastimes, games like Mahjong have a strong following. Quick to play and mentally engaging, they’re the perfect fit for a train ride. Many commuters turn to digital Mahjong platforms to pass the time, enjoying features like daily challenges and scoring guides that make short rides more engaging (source: mahjong365.com). For players trying to keep up with a streak or reach a new high score, a dropped connection can be more than just an annoyance. It can interrupt progress and take the fun out of what’s meant to be a relaxing moment.
But during rush hour, these types of apps can suffer. Multiplayer functionality hangs, video buffers, and downloads fail to come through, not because the technology is poor, but because everyone is doing the same thing at the same time.
The story is different at other times when people are not commuting in high numbers. Last year, network providers such as Rakuten Mobile upgraded significantly throughout Tokyo, resulting in average speeds that are significantly higher. The traffic passengers going midday or late in the evening tend to experience fast and smooth 5G without disruption.
The outstanding performance of the Shinkansen of Japan is even more impressive. These trains have a stable 5G connection and can download data at 500 Mbps even though they traverse at more than 300km/h. With high signal handoff along with signal shaping, location-specific users can stream or work on the web with no delays, even driving at high speeds across the countryside. This degree of performance emphasizes what technically can be done when the system is not overloaded.
The difference isn’t the hardware; it’s the number of users. A packed subway train at 8 a.m. has far more active devices than a high-speed train crossing rural Japan. That crowd density makes all the difference, especially when everyone is online at once.
Network providers are working on it. There will be more local cell coverage, better signal processing, and 6G advancement in the future. However, in the meantime, it is probable that the daily commuters in Tokyo will continue to experience slower speeds at the time when they require it the most.
Mobile networks are no longer unlimited, even in one of the highly technological cities like Tokyo. With rising digital tendencies, the load on such networks is only going to rise. To anyone who needs to use 5G to work or play, it becomes a reminder that, no matter how fast technological advances are made, it still has to keep up with the real-life application.
