How should the angle cocks be positioned on all but the last car during a pick up?

The correct positioning of the angle cocks on all but the last car during a pick up is to have them in line with the pipe. This orientation allows for the proper flow of air through the train line, ensuring that the brakes can function effectively when needed. When angle cocks are in line with the pipe, they facilitate seamless airflow and pressure communication, which is crucial for activating the air brakes on the connected cars.

The angle cock should always be aligned to ensure that there is no obstruction in the air lines. This prevents potential issues during the operation of the train, such as brake malfunction or failure. Keeping the angle cocks in line with the pipe also means that all cars will be ready to receive the air pressure necessary for braking when the train is in motion.

Other positions, such as closed or at a 45-degree angle, would either restrict the airflow or create an incomplete connection, leading to inconsistent brake performance. The option of being in an 'off' position could completely isolate the car from the braking system, which is not acceptable for safety and operational purposes. Thus, positioning them in line with the pipe is essential for safe and effective train handling.