What is the result of applying a service rate pressure using the brake handle?

When a service rate pressure is applied using the brake handle, it is a method used to achieve a controlled reduction in pressure within the brake system. This entails reducing the equalizing reservoir and brake pipe pressure, which is vital for slowing or stopping the train gradually. This process allows for the brakes to engage smoothly without leading to a sudden stop, which can cause jerkiness or potential harm to cargo and passengers.

As brakes are applied, the reduction in brake pipe pressure is transmitted to the freight cars through the air brake system, leading to the gradual engagement of brake cylinders. This orchestrated reduction in pressure enables a more manageable approach to deceleration compared to an immediate full application, which can occur in an emergency situation. Hence, the proper application of service rate pressure effectively manages the braking force required to stop the train safely and efficiently.