Contractors working with Network Rail must fit new vehicles with 70mph speed limiters under a new code of conduct.
The rail infrastructure operator published a set of minimum standards for its suppliers.
The ‘code of conduct’ will be embedded into all Network Rail contracts. The body is in charge of more than £12bn of projects to improve the railway in the five years to 31 March 2019.
Behaviours outlined under the driving section of the code of conduct include fitting new vehicles with speed limiters as well as robustly checking driving licences and eyesight.
Other areas of the code look at safety, wellbeing, community, competency, equipment and ethics.
Network Rail chief executive Mark Carne said: “At Network Rail we’re committed to the highest standards of business ethics, appropriate behaviour and safety performance and we expect the same from those we do business with.
“We must all work to achieve our vision of everyone home safe every day and that will often mean we will have to go beyond this baseline.
“Trust is gained by treating each other and the communities we work in with respect and fairness and by behaving in a way that is challenging, collaborative, accountable and customer-driven.”