The department keeps the impacts of the domestic market for rolling stock on UK manufacturers under regular review and works closely with rolling stock companies and train operators to understand when new trains are required. However, passenger trains are major assets with a lifetime of 35-40 years and there will naturally be peaks and troughs in the procurement cycle. As the market for rolling stock is a competitive one, there can be no guarantee of orders for individual manufacturers, and they will need to factor these into their own business planning decisions.