Two Hertfordshire railway stations have topped a table for having the worst mobile connectivity in London.

A study from network testing company Global Wireless Solutions has revealed the poor state of mobile connectivity on popular commuter routes – with two Hertfordshire stations ranking in the top five worst stations in London.

Engineers tested the ten most popular commuter routes, and found that one in three mobile internet tasks and one in seven voice calls on commuter trains fails.

While St Pancras Station in London took home the prize of being the worst station in London, Radlett managed second place with Elstree and Borehamwood station coming in fifth.

Borehamwood Times:

On average, the average number of voice and data failures at Radlett station was 53, while Elstree and Borehamwood clocked up a total of 36 failures.

The company's CEO Paul Carter said: “Leaves on the track, the wrong kind of snow, having to stand up all the way to work and back – commuters have enough to contend with without the kind of mobile connectivity problems we’re revealing today.

“Pressure from commuters makes it inevitable that trains won’t keep their status as mobile dead zones for much longer.

“It’d be great to see networks, rail operators and station-masters taking the lead on improving connectivity for commuters – rather than having to be dragged into the 21st Century kicking and screaming.”

Overall, the study found that the network Three is most reliable network for commuters who like to talk, while Vodafone’s subscribers receive the best 3G service and EE subscribers receive the best 4G service.

The study also found that a quarter of failures occurred while engineers were on trains in stations, while only one in five occurred when they were onboard on open stretches of track.

Voice calls, however, were found to be more likely to fail on open track.