Which method is NOT valid for reporting clear of limits for a train without a crew member on the rear?

The method of assuming the train is complete is not a valid way to report clear of limits for a train without a crew member on the rear. Properly reporting clear of limits involves using verified, tangible methods to ensure safety and accountability on the railways. Assuming a train is complete lacks the necessary confirmation and does not provide the concrete evidence needed for operations.

In contrast, using a rear-end telemetry device allows for technological confirmation of the train's status. Personnel verification of the marker ensures that a crew member can visually confirm the rear end of the train, mitigating the risks associated with operating a train without constant oversight. Confirming air pressure continuity involves checking that the train’s brake system is functioning properly, further ensuring that any conditions affecting the train's operation are monitored correctly. Each of these alternative methods provides necessary checks and balances to guarantee safety and compliance with operational protocols.