Tata Communications will be able to reach 17,000 passengers a day.
Heathrow Express trains will all soon be wrapped in Tata Communications branding as the two strike a sponsorship deal.
The deal is the first for Tata Communications in the UK and will see the company use on-board digital screens and TV-spots, alongside digital airport panels, to raise awareness of its sponsorship role and the services it offers.
Heathrow Express, which carries 17,000 passengers a day between Paddington and Heathrow Airport, provides a captive audience for 15 minute journeys.
Julie Woods-Moss, Chief Marketing Officer, Tata Communications, said: "For B2B brands like Tata Communications, it can be a challenge to find great brand platforms. The Heathrow Express is a great fit for us.
"We bring cloud, mobile and network services to enterprises across 240 countries, at the highest speed possible."
Tata Communications, which offers cloud, collaboration and mobility services also owns and operates the world’s largest subsea fibre cable network, including a fibre ring around the world.
Fraser Brown, Heathrow Express Director, said: "Connecting business travellers from around the world, at speed, is a goal we share with Tata Communications. Tata Communications’ ‘We’re the connection’ and ‘speed’ messaging naturally appeals to our customers.
"We are always looking to improve the customer experience at Heathrow Express. Speed is at the heart of our service, and that’s why business travellers continue to use our trains. With all this in mind, we’re delighted to have joined forces with Tata Communications."
Additional partners for Heathrow Express advertising include JCDecaux, Airport UK and McCann Enterprise.