Two consortiums have bagged up to £800M of track renewals work from Network Rail.
Amey Sersa will take care of switches and crossings renewal work in Scotland, the London-North East line and the northern portion of the London-North West line for a decade.
Colas URS will have the same responsibility for Anglia; Kent and Sussex; the Western, Wales and Wessex region; and London-North West south.
The contracts are expected to be worth up to £400M each.
Meanwhile, regional five-year plain track renewals contracts were awarded to Babcock, Carillion and Colas. These are expected to be worth £200M, £100M and £75M respectively.
Network Rail said it would be bringing its national high output track renewals programme back in-house when Amey Colas’ deal expires in March 2015.
Steve Featherstone, track programme director at Network Rail, said: “Today, there are a million more trains on our network than a decade ago and that number increases every year.
“Working with our delivery partners, we will deliver a massive programme of work to maintain, renew and enhance thousands of miles of track over the next five years, with the goal of providing a more reliable railway for passengers and freight.”