What is a sign of improper equipment maintenance in a single locomotive?

A defective brake shoe is a clear sign of improper equipment maintenance in a single locomotive because brake shoes are critical components in the braking system. They are responsible for creating friction against the wheels to slow or stop the locomotive. If a brake shoe is defective, it may be worn down, cracked, or damaged, which can lead to reduced braking effectiveness, increased stopping distances, and potentially unsafe operating conditions. Regular maintenance checks should include the inspection and replacement of brake shoes to ensure safe operations and compliance with safety standards. Inadequate attention to this critical component indicates a lapse in maintenance practices.