What is the normal main reservoir pressure range?

The normal main reservoir pressure range being 125-150 lbs is correct because this range aligns with the standard operating pressures for many train systems that utilize air brakes. The main reservoir supplies compressed air that is essential for the operation of various components, including the braking system. Maintaining air pressure within this specified range ensures proper functioning, allowing for immediate and effective application of brakes when needed.

Operating outside this range can lead to issues such as insufficient braking force or potential mechanical damage to the air systems, resulting in inefficiencies or safety hazards. Therefore, understanding and adhering to this normal pressure range is crucial for safe and efficient train operations.