What is the standard brake pipe pressure for yard or freight service?

The standard brake pipe pressure for yard or freight service is typically set at 90 psi. This pressure is essential for ensuring the safe and effective operation of the braking system in freight trains. A brake pipe pressure of 90 psi allows for a proper balance between sufficient braking force and system responsiveness. It also aligns with established safety protocols and operational guidelines that have been developed over time, ensuring that freight trains can operate efficiently while maintaining safety standards.

In yard service and freight operations, this pressure is commonly used to help achieve the required stopping power and control during various operational scenarios, such as coupling and uncoupling cars or managing loads over varying track grades. The application of 90 psi helps to standardize the system, which is essential for consistent train operations across different regions and trains.