When must periodic Running Air Brake Tests be performed during inclement weather?

Periodic Running Air Brake Tests are particularly crucial in inclement weather to ensure the safety and functionality of braking systems. When snow accumulates to or above the top of the rail, it can obstruct the smooth operation of the train, affecting both traction and braking response. The presence of deep snow can conceal track conditions and alter the performance of braking systems, making it essential to conduct these tests. Ensuring that the air brakes are functioning reliably in such conditions helps mitigate risks associated with impaired braking capability, which can be critical for the safety of the train crew and any cargo being transported.

On the other hand, while heavy rain and low visibility due to fog can present their own challenges, the specific requirement for testing in response to snow depth reflects a unique and pressing safety concern associated with snow and ice, which can have a direct, significant impact on the mechanical performance of the train’s braking system. The need for maintenance and testing to adapt to severe weather conditions is paramount in maintaining safety standards in rail operations.