What is the diameter of a hand brake shaft for FRA standards?

The diameter of a hand brake shaft that meets FRA standards is indeed specified to be 1 1/4 inches. This measurement is crucial because it ensures that the hand brake system is robust enough to provide the necessary force for braking, while also conforming to safety regulations set forth by the Federal Railroad Administration.

The specified diameter is intended for both functionality and safety, making sure that the hand brake can withstand the forces applied during operation and prevent failure under high-stress conditions. This dimension is derived from extensive testing and engineering standards that prioritize reliability and effectiveness in rail operations. Using a larger diameter also helps accommodate wear over time, ensuring that the braking system remains effective throughout its use.