
The ad for Virgin Media’s broadband features the words "broad" and "band" at the beginning and end of the 73-metre billboard. The site, owned by Titan, is located alongside the lines in and out of Euston station.
According to Titan, around 1.2 million people will be exposed to the ad over its two-week run.
The ad was designed by Rapier. Virgin Media’s media agency, Manning Gottlieb OMD, booked the space with Titan's account manager, Elizabeth Turnock, and Kath Taylor, Posterscope's senior account manager.
Ashley Stockwell, managing director of brand and marketing at Virgin, said: "Virgin Media delivers the fastest and most reliable broadband in the UK and the new, and giant, Euston Broadside billboard was the perfect place to shout about it."
Stephen Dunn, the group sales director at Titan, said: "It is great that a big brand like Virgin Media has seen the potential of this magnificent site.
"Our rail portfolio is stronger than ever and the addition of the Broadside adds another advertising dimension."
Last month, Titan launched a copywriting competition with creative agencies to design an ad for the Euston Broadside.
The winner (to be announced at the end of this month) will receive a two-week campaign for their client and a luxury weekend break in Paris.