What is the minimum number of non-defective ties required within a 39-foot segment in a turnout for Class 5 track?

In rail infrastructure, particularly in the context of turnouts (which are crucial for enabling trains to switch from one track to another), the number of necessary non-defective ties is determined by standards that ensure the structural integrity and safety of the track. For Class 5 track, a minimum of 14 non-defective ties within a 39-foot segment is stipulated.

This requirement is based on safety considerations and operational efficiency; having enough non-defective ties helps distribute the load of the train and maintain alignment, reducing the risk of derailments or other track-related issues. Each tie plays a critical role in supporting the rails and maintaining gauge throughout the turnout area.

While other numbers are provided as options, they do not meet the minimum safety and operational standards set forth for Class 5 track. Hence, the choice indicating 14 ties is the only correct one that aligns with the established guidelines for maintaining safe and reliable rail operations.