The RMT has rejected plans by Chiltern Railways to operate train services on the new East West Rail line between Oxford and Milton Keynes as a Driver-Only Operation (DOO). An East West Rail test train at Steeple Claydon. // Credit: Network RailThe RMT has reiterated its long-standing opposition to DOO unless there is a second safety-critical member of staff on the train. The union is demanding clear guarantees from Chiltern that its East West Rail services will include a mandatory requirement that there will be a second safety-critical member of staff on board, and the trains will not run as a Driver Only Operation. Test train on East West Rail at Bletchley.