Unions and managers are set on a collision course at Network Rail over its plans to speed up modernisation of the industry in the wake of a wide-ranging study. Sir Roy McNulty's overview called for savings of £1 billion a year to be made by the end of the decade in order to avoid further line closures. The RMT union demanded increased annual leave and voluntary retirement on full pension entitlement at 55 in return for agreeing to the changes.