East Coast’s investment wants to achieve a more reliable internet connection on each of its 44 trains.
The train operator’s improvements will begin to roll out in early 2014.
East Coast commercial and customer service director Peter Williams said: “We know that Wi-Fi is one of the key reasons why people choose to travel with us, instead of driving or flying.
“It’s vital that our system keeps up with rapidly rising demand from passengers, starting with a more reliable connection into the system from the moment their journey with us begins.
“The investment we are making will upgrade the consistency of the service, by replacing on-train servers, access points and switching equipment which is used to deliver Wi-Fi in every carriage.
“We want our passengers to feel at home whenever they travel with us.”