When should the master controller switching position be used?

The master controller switching position is specifically designed for use during the coupling and uncoupling of train cars. This position allows the train operator to manage the electrical and pneumatic connections safely when connecting or disconnecting train units. When cars are being coupled, the switching position helps ensure that appropriate systems are engaged or disengaged during the process, allowing for a seamless and safe operation.

Utilizing the master controller in this context minimizes the risk of accidents or equipment damage, as it is tailored for the unique requirements involved in handling train components. Other options, such as executing emergency stops or activating the horn system, do not specifically require the master controller's switching function, as those tasks can be performed using different controls better suited for those purposes. Similarly, during normal operations without stops, the master controller is expected to be in a standard operational position rather than the switching position reserved for the coupling and uncoupling process.