Rail signalling systems in the West Midlands will receive a £105 million overhaul over the next three years as part of a £2 billion programme planned by Network Rail (NR).
The company aims to spend £350 million at Leamington and Water Orton over the next five to eight years.
NR's major projects and investments director Simon Kirby said: "This is great news for millions of passengers who will find their journeys significantly improved. Investment on this scale will reduce delays by improving the reliability of the railway.
"This will mean long-term benefits from a better rail network for different regions across the country.
"Delivering efficiently with the right supplier is hugely important.
"We have made long-term commitments to suppliers, giving them the opportunity
to invest in the development of technology. In return, we have received long-term cost guarantees, helping us to achieve our cost targets."
Upgrades, such as bridge improvements and track renewal work, will take place alongside signalling work to maximise use of the access to the track and minimise disruption for passengers.
The £2 billion plan is subject to rail regulatory and Government approval.