Which type of signal head configuration is associated with messenger wire support?

The type of signal head configuration associated with messenger wire support is single point attachment. This configuration involves suspending the signal head from a single point on the messenger wire, which allows for flexibility and movement of the signal head. This is particularly useful in areas where environmental factors, such as wind, can affect the stability of the signal head. The single point attachment system is designed to accommodate minor shifts without compromising the visibility or functionality of the signal.

Messenger wire support systems typically utilize single point attachments to secure signal heads in a way that maintains optimal position and alignment. In contrast, dual point suspension tends to involve a more rigid setup, which may not provide the same level of adaptability as a single point attachment. Other configurations like anchor style and structural framework involve different support methodologies that are not specifically designed for the flexible characteristics of messenger wire systems.