What is a Dual Control Switch?

A Dual Control Switch refers to a switch mechanism that provides the flexibility to operate in two ways: it is typically powered for remote operation but also designed for manual operation if necessary. This dual functionality is essential in railway operations as it allows for efficient remote control while still enabling manual intervention during maintenance or emergencies when power may not be available or has failed.

The power operation feature enhances operational efficiency, as it can be controlled from a distance, allowing trains to pass through without stopping. However, should the need arise for manual control—due to system failures or specific operational requirements—the switch can be easily operated by hand, thus ensuring that rail operations can continue smoothly.

In contrast, a power-operated switch that can only be operated by hand would not provide this versatility, limiting operational flexibility. Similarly, an electrically controlled signal system does not pertain to the physical switching mechanism, and a manual switch with no power operation would lack any of the benefits afforded by a dual functionality. Hence, the characterization of a Dual Control Switch as a power-operated switch that can also be operated by hand accurately captures its purpose and operational advantages.