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BBC News, education correspondent
Commuters are so regularly using travel time for work emails that their journeys should be counted as part of the working day, researchers say.
Wider access to wi-fi on trains and the spread of mobile phones has extended the working day, a study from the University of the West of England says.
The study examined 5,000 rail passengers on commuter routes into London as wi-fi became more available.
"I am a busy mum and I rely on that time," one commuter told researchers.
The rail system is "bursting at the seams" says Chris Grayling
The BBC follows one Northern rail user, Lorna, on her daily commute from Burnley to Leeds.