If a train separates or air hoses uncouple twice between the same two cars, what is the general requirement for these cars?

When a train separates or air hoses uncouple twice between the same two cars, the general requirement is that these cars are to be set out at an authorized point. This policy is in place to ensure the safety and integrity of the train operations. Repeated issues with separation or uncoupling suggest potential mechanical failures or problems with alignment between the cars, which could pose hazards if the cars are allowed to continue in service without inspection.

Setting the cars out not only allows for an evaluation of their condition but also ensures that any underlying issues are addressed before the cars are returned to service. This procedure helps prevent accidents and maintains the overall safety of railway operations.

The other options do not align with safety protocols established by railway regulation and practice. Proceeding to the nearest station or allowing the cars to continue without inspection undermines safety, while both cars remaining in service without appropriate checks could lead to more severe mechanical failures or hazardous situations.