In relation to hand signals, what does swinging at arm's length refer to?

Swinging at arm's length is a specific hand signal used to convey instructions to train operators. When a signal is swung at arm's length, it indicates to reduce speed. This action typically allows the train crew to understand that they should be cautious and prepared to respond to changes in conditions ahead, such as upcoming signals or potential hazards.

The use of hand signals is crucial in rail operations, as they provide visual cues that help maintain safety and communication in situations where radio communication may not be possible or effective. Understanding this particular gesture, along with its intended meaning, is essential for ensuring safe train operations and responding appropriately to instructions given by signalers or conductors.