Under the following conditions, a train that has experienced a cab signal, automatic train stop, or speed control failure may be dispatched from a turnaround point, governed by the rules that apply to an en route failure?

Under the following conditions, a train that has experienced a cab signal, automatic train stop, or speed control failure may be dispatched from a turnaround point, governed by the rules that apply to an en route failure?

• A. The equipment is used in turnaround service between its originating terminal and the turnaround point; The equipment received a satisfactory cab signal test within the previous 24 hours; No mechanical forces are on duty at the turnaround point to repair the equipment.
• B. The equipment is used only in maintenance yard operations.
• C. The equipment has not received any cab signal test in the last 48 hours.
• D. The train is dispatched only if there is special authorization for passenger service.

Answer: (C)

When a train experiences a cab signal, automatic train stop, or speed control failure, dispatch from a turnaround point is allowed under en route failure rules only if the testing or status of the equipment aligns with the required testing window. The statement that the equipment has not received any cab signal test in the last 48 hours fits that rule, making the train eligible to be dispatched under those en route failure provisions. It reflects the condition that the equipment hasn’t been recently tested, which, under these rules, still permits dispatch from the turnaround point with the appropriate safeguards and follow-up actions. The other conditions don’t match this rule. Requiring a cab signal test within the previous 24 hours would impose a more stringent timing that isn’t the criterion described for en route failure dispatch. Limiting to maintenance yard operations excludes the en route scenario entirely. Requiring special authorization for passenger service adds an extra layer not specified by the en route failure rules in this context.

When a train experiences a cab signal, automatic train stop, or speed control failure, dispatch from a turnaround point is allowed under en route failure rules only if the testing or status of the equipment aligns with the required testing window. The statement that the equipment has not received any cab signal test in the last 48 hours fits that rule, making the train eligible to be dispatched under those en route failure provisions. It reflects the condition that the equipment hasn’t been recently tested, which, under these rules, still permits dispatch from the turnaround point with the appropriate safeguards and follow-up actions.

The other conditions don’t match this rule. Requiring a cab signal test within the previous 24 hours would impose a more stringent timing that isn’t the criterion described for en route failure dispatch. Limiting to maintenance yard operations excludes the en route scenario entirely. Requiring special authorization for passenger service adds an extra layer not specified by the en route failure rules in this context.