What is the preferred method for checking brake pipe leakage?

The preferred method for checking brake pipe leakage is the air flow method. This technique involves assessing the flow of air through the brake pipe to identify any potential leaks. By using this method, train crews can effectively monitor the integrity of the brake system because it allows for real-time assessment of air loss.

Unlike some other methods that may only provide a snapshot or indirect indication of leaks, the air flow method offers a direct measure of how well the brake pipe is holding pressure. This is particularly important in ensuring the safety of the train operation, as any leaks in the brake pipe can lead to a reduction in braking effectiveness.

Static pressure testing, visual inspection, and acoustic monitoring have their uses in identifying different issues but may not provide the immediate and quantitative results needed to assess brake pipe integrity as effectively as the air flow method does.