Rail passengers used this company’s website and mobile app to book tickets worth £2.3bn last year. The group records more than a billion cloud interactions a year, and is developing products, using AI and machine learning, to streamline its customer services — for example, its recently launched BusyBot crowdsources passengers’ messages to pinpoint empty seats. It was acquired by private equity firm KKR in 2015 for a reported £450m, and in March last year, chief executive Clare Gilmartin, 42, led the acquisition of French counterpart Captain Train for an undisclosed sum.

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Company details
Year2017
Rank177
CompanyTrainline
ActivityTrain ticket retailer
LocationCentral London
Sales £m*152.8
Operating profit £m*17.7
Main shareholdersKKR (>50%), management (<50%)
Staff450
Founded1997
Websitewww.thetrainline.com

If applicable:

* supplied by Company   † annualised figure   ‡  profit = ebitda