Network Rail has launched a £4bn framework, covering tunnelling bridges, shafts and subways.
The framework encompasses works to all elements of railway infrastructure, including building and civil engineering, power, signalling, telecommunications and track works.
The track operator is seeking suppliers to carry out works primarily on Western and Welsh routes, but those winning places on the framework will be able to work across the whole UK rail network.
The framework is split into six lots, which all run for eight years, with a total value of £4bn.
Two of lots cover the Western routes, and the other four cover Welsh routes.
Proposed works under the framework include the primary repair and refurbishment as well as life extension work to rails.
Contractors must prove their expertise in earthworks, metallic structures, building and civil engineering.
Network Rail is expecting to appoint 17 different contractors to the framework and is expected to send out inviations to tender on Monday October 8.
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