The outdoor specialist said it has kept the rail advertising business after a competitive pitch against other undisclosed media owners.
CBS Outdoor will continue to manage on-station advertising across all FirstGroup's rail franchises, which include First Capital Connect, First Great Western, ScotRail and First TransPennine Express.
In addition, CBS Outdoor will also manage the on-train advertising on ScotRail.
FirstGroup claims to operate a quarter of the UK passenger rail network, some 280m travellers per year, spanning intercity, commuter and regional services.
Jason Cotterrell, franchise director at CBS Outdoor, was "delighted" to be reappointed by FirstGroup, and said it represents the "cornerstone" of the company's overland rail advertising.
CBS Outdoor also manages FirstGroup's bus advertising asset on approximately 8,500 buses operating in more than 40 towns and cities across the UK, carrying three million passengers every day.
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