What must be done during a winter storm while running on clear signal indications?

During a winter storm while running on clear signal indications, performing periodic running air brake tests is essential to ensure that the train’s braking systems are functioning properly. Winter weather can lead to ice and snow accumulation on the train and track, which may adversely affect braking performance. By conducting periodic tests, the train crew can verify that the brakes are responsive and adequate for the conditions, ensuring safety and control throughout the journey. This practice helps the crew remain vigilant about any potential issues that may arise due to the winter conditions and allows for timely adjustments to be made if necessary.

While speed tests, constant speed reductions, and checking weather reports may be important for overall train handling and safety protocols, the priority in maintaining braking system integrity under adverse conditions directly aligns with the necessity of air brake tests, making this the most appropriate action during a winter storm.