Track design allowing movement at joints.

• A. Carriage
• B. Hinged Track
• C. Swivel Seat
• D. 15 Minute Leak Test

Answer: (B)

This item focuses on how the track is joined to handle movement at the joints between sections. In long track rails for moving walks and escalators, segments must fit together tightly yet still be able to flex a little as the system runs, expands, or settles. A hinged track provides hinge joints between sections, allowing slight angular or lateral movement. That controlled flex keeps the track aligned with the drive carriage and rollers, reduces stress, and prevents binding when sections shift or when temperature and loads change.

The other options aren’t about how track sections move at joints. The carriage is the assembly that carries the steps or tread along the track, not the joint design itself. A swivel seat isn’t related to track structure, and a 15 Minute Leak Test is a maintenance procedure, not a track design feature.