[2026-06-07 Image ©The British Travel Magazine] WiFi on British trains is notoriously poor. The way it works is that there is a router, usually one per carriage, that delivers the WiFi to passengers and relays the signals through the mobile phone network. The system relies on a good mobile signal up and down the rail lines. Whilst the signal is fine in built up areas, and so the WiFi is good, in the fields that the train rushes through there is little to no houses and so little to no mobile signal.
The focus for the mobile operators is in providing mobile signal in areas of population, covering some 98% of the UK population, but the geographic coverage is much lower 81% from all 4 operators. The missing locations are unpopulated rural areas, just those that train speed through. This 81% figure is the figure for some coverage, and not any service level. A more than minimal level of service is needed for trains. A high speed train travelling at 100mph has a much more degraded signal than a person standing still at the same location.
But hope is on the way. Currently the backhaul, the mobile signal back to the core, uses regular phone masts. It would take a major investment to get the required number of masts to enable good WiFi on trains, although this would have added benefits to the rural community. UKG, having nationalised the trains in the Uk, are investing in providing satellite connections from the coach. This should improve the backhaul from the train. Much technical work does need to be done to ensure that this technology works the way it is envisaged. A fixed satellite link on a stationary caravn is one thing, a satellite link on a train moving at 100mph is another.