What is the standard operating air pressure for Norfolk Southern freight trains?

The standard operating air pressure for Norfolk Southern freight trains is 90 psi. This pressure is critical for ensuring the effective operation of the air brake systems used in freight trains. These systems rely on compressed air to operate properly, allowing for safe and responsive braking. Maintaining the correct air pressure is essential for ensuring that the brakes function as intended, which directly impacts both safety and efficiency in train operations.

In freight train operations, the standard air pressure helps to provide a consistent response and effectiveness in braking, enabling the train to stop securely and maintain control during various operating conditions. This is why the selection of 90 psi is significant in the context of Norfolk Southern's operational standards.