London Underground closes 5G gap as street-level signals improve

Underground 5G performance outpaces city averages

London’s Tube network has boosted 5G coverage, narrowing the gap between underground and street-level signals, according to a recent Ookla analysis published on Wednesday. The study examined data from September 2026 and found that mobile reception below ground now exceeds the citywide average, indicating a significant infrastructure upgrade.

Ookla’s report shows average 5G download speeds of 350 Mbps in tunnels compared with 280 Mbps citywide. Engineers attribute the improvement to upgraded fiber connections and dedicated small cells installed along platform edges. These changes allow carriers to maintain signal strength despite the metal walls that normally block radio waves.

The analysis covered 1.2 million data points collected across 250 Tube stations between January and August 2026. Ookla’s senior analyst noted, „Consistent 5G presence underground demonstrates the effectiveness of our recent rollout strategy.” This suggests that investment in tunnel-specific hardware is paying off.

The report also highlighted that 5G latency dropped to 20 ms in tunnels, compared with 35 ms citywide. This low latency is crucial for real‑time applications such as ride‑hailing and emergency communications.

Can the Tube’s 5G boost set a national benchmark?

If the trend continues, other metros may follow suit, accelerating nationwide 5G deployment. Transport for London says the upgraded infrastructure could support future autonomous vehicle trials and enhance passenger Wi‑Fi reliability. Analysts warn that sustained investment will be needed to keep pace with growing data demand.

Commuters will benefit from faster downloads and more reliable connections while traveling. The success could influence policy, prompting greater funding for underground digital upgrades across UK cities. However, ongoing maintenance costs may strain budgets, requiring public‑private partnerships to sustain the service.

Ookla gathered data from millions of device tests at 250 stations between January and August 2026. The analysis compared download speeds and signal strength inside tunnels with citywide averages.

Engineers installed small cells on platform edges and upgraded fiber backhaul to reduce signal loss. These measures counter the attenuation caused by metal structures.

No immediate changes to fares or train schedules are planned. The focus remains on enhancing digital services without disrupting operational timings.