What is the top cord of an aerial ladder called?

The correct term for the top cord of an aerial ladder is "Truss Rail." This is a structural component of the ladder that provides strength and stability. The truss rail is designed to support the ladder's load while maintaining its integrity during operation. Its design facilitates the ladder's ability to articulate and extend, which is essential for reaching elevated areas safely.

In aerial ladders, the truss rail's construction allows for a balance between weight and strength, making it essential in firefighting and rescue operations. Understanding the role of the truss rail is critical for safe and effective use of aerial ladders.