What is the primary reason for cutting out battery switches?

Cutting out battery switches is primarily done to prevent loss of air. In electric trains, the air system is crucial for various operations, such as braking, and maintaining the air pressure is essential for ensuring that all pneumatic systems function correctly. When a battery switch is cut out, it typically indicates that there is an issue with the electrical system or maintenance protocol that could lead to air pressure being compromised. By ensuring that the air system remains operational, the safety and efficiency of train operations are maintained.

In this context, reducing power consumption, enhancing braking efficiency, or improving signal clarity may be important in various operational scenarios, but they are not the primary reasons for cutting out battery switches. The focus on air pressure aligns more closely with the direct operational requirements that affect the overall safety and functionality of the train system.