Who is authorized to perform inspections and brake tests on freight cars?

The correct choice indicates that inspections and brake tests on freight cars must be conducted by a Qualified Person, Qualified Mechanical Inspector, or Qualified Maintenance Person. This requirement is designed to ensure safety and reliability in the operation of freight trains.

Individuals in these roles have undergone specific training and meet established standards to understand the complexities and safety protocols associated with air brake systems. They are familiar with the regulations, inspection procedures, and maintenance practices necessary to assess the functionality of the braking systems diligently.

Having qualified personnel perform these inspections helps prevent accidents caused by brake failures, which could jeopardize not only the safety of the train crew and freight but also the general public. The authority to conduct these inspections is not left to just anyone on the crew, nor is it limited to only the train conductor or state-certified examiners, underscoring the importance of specialized knowledge in ensuring proper safety measures are followed.