What is the appropriate action when two consecutive control valves on an articulated car are found to be inoperative?

When two consecutive control valves on an articulated car are found to be inoperative, the appropriate action is to set the car out. This decision is critical for ensuring the safety of the train and its operation. The control valves are essential components that manage the flow of air and fluids, and their proper functioning is necessary to maintain safe braking and overall train control. If these valves are not operational, it could lead to severe safety risks, including inadequate braking performance, which endangers both the crew and passengers.

Taking the step to set the car out effectively prevents potential issues from escalating, ensuring that the car does not compromise the reliability and safety of the train. This action allows for maintenance or repair work to be conducted without affecting the operational integrity of the train during its journey. Other options may involve operating the car or performing repairs on-site, which could introduce significant safety hazards if the inoperable valves cause malfunctions during transit.