Which statement best describes a Dual Control Switch?

A Dual Control Switch is specifically designed to be operated by both a powered mechanism and a manual method. This dual capability is essential for maintaining operational flexibility, especially in scenarios where the powered operation might fail or be unavailable. By allowing for manual operation, it ensures that train movements can continue safely even in adverse conditions or equipment malfunctions.

The other options do not accurately capture the functionality of a Dual Control Switch. While some switches might be operated exclusively by a machine or may incorporate safety features for harsh weather, these characteristics do not define what a Dual Control Switch is. Additionally, while signaling may be involved in rail operations, the primary feature of a Dual Control Switch is its dual method of operation rather than its connection to automatic signaling.