How do trains access wifi signals?

[sheff1]

I've tried to use EMT and EC wifi and have failed dismally to get online using either service, so I just use my normal 3G signal on my phone and if that goes down, well it goes down.

Have found EMT to be pretty reliable and hence very useful on the Derby - Sheffield section especially where the normal coverage is poor to non-existent.

 

[RPM]

I often wonder how many of those complaints are down to user error? Just from spending time on the services in question I see some people insistent that the WiFi is knackered in a coach despite the fact that the guy sitting opposite them has managed to connect to it.

Yes I suspect that is often the case. Either user error or an error on the user's device.

 

[JGR]

When 4G is more widespread then on train WiFi will be massively better. Not only is 4G faster, it uses a lower frequency radio wave which means the signal will travel further from a tower (meaning fewer black spots) and they penetrate buildings and structures better.

4G in UK occupies 2 bands (ignoring EEs sliver of 4G in the 1.8GHz 2G band), the lowest of which (800MHz) does has better area coverage, and will be deployed in rural areas, but will be significantly slower than the 2.6GHz 4G urban services.

More significantly though, by the time that 4G is prevalent enough that it'll be actually usable between cities on the train, on-train wifi will probably be all but forgotten, especially if you have to pay for it.