Which of the following is NOT considered a non-complying condition for locomotives?

Windshield wipers functioning properly is a requirement for ensuring visibility and safety while operating a locomotive. This condition is essential for safe operation, particularly in adverse weather conditions. Therefore, when windshield wipers are functioning, they do not represent a non-complying condition—rather, they confirm compliance with operational standards.

The other conditions listed indicate issues that may impede the safe operation of a locomotive or violate safety standards. For instance, defective weather stripping may lead to increased exposure to elements, which can affect both the equipment and crew. A burned-out headlight bulb compromises visibility during operations, which is critical for safety. Additionally, a tripped ground relay can signal electrical issues that need addressing to ensure safe locomotive operation. Each of these represents a potential safety hazard or operational compliance issue, whereas the functioning windshield wipers do not.