Many commuters will sit on delayed trains, or stuck in traffic jams, silently penning letters in their heads to railway managers, councillors or MPs, venting their frustration.

They rarely follow through by sending them, but Dominic Utton does – 78 letters and counting – to train operator First Great Western’s managing director Mark Hopwood and director of communications Sue Evans since last June, totalling 81,934 words.

All go on Mr Utton’s blog Letters to First Great Western, along with the replies from the rail firm, including 31 from Mr Hopwood.

The 39-year-old father-of-two takes out his laptop every time his train does not arrive in London or Oxford on time or stops unexpectedly in the middle of a journey.

The West Oxford resident said he hoped the letters took as long to read as it took him to write them – and was delayed for.

He said: “It’s a revenge thing. It’s like ‘you are wasting my time, I am going to waste your time’. It’s totally childish and puerile.”

However, he added: “It’s obviously not working that well. But I will continue until they start running on time.”

The freelance journalist, a commuter for two years, said: “The trains are rubbish – they are constantly delayed. People just sit there and you have this English thing where you internalise and get furious but do nothing about it.”

Mr Utton, who catches the 8.06am from Oxford to London and 6.51pm or 7.21pm return services, said: “I’m paying a lot of money, £480 a month, and the trains aren’t doing what they say they do.”

He said of his children Albert, three, and Eithne, four: “I can go days where I don’t see them at all.”

Taking into account his 100-word-a-minute typing skills, the torrent of letters means Mr Utton has spent nearly 14 hours in full flow.

But the Alexandra Road resident said writing the letters passed the time and he was pleased to have so far attracted 38,000 page views on his blog.

Mr Hopwood has provided detailed replies about the reasons for delays. He wrote this month: “My replies might not be lengthy (I am conscious not to make any further demands on your time) but I do fully understand your annoyance.”

FGW spokesman John Ratchford said: “We appreciate feedback from any customer. Given his dual role as a journalist and a customer, we welcome his feedback .”

To follow Mr Utton’s correspondence with First Great Western, click on the link below