Which of the following should be checked before throwing a hand-operated switch?

Before throwing a hand-operated switch, checking the tension is crucial for ensuring the switch operates safely and correctly. Tension refers to the force with which the switch components are held in place, and verifying it helps prevent potential issues such as the switch not aligning properly, which could lead to derailments or misrouting of trains. Proper tension ensures that the switch can effectively guide the train onto the correct track, maintaining the safety and integrity of the rail operation.

Focusing on tension is vital because it directly impacts how well the switch functions under various conditions. If the tension is too loose, the switch may not engage or stay in the designated position, while excessive tension could make it difficult to operate the switch. Hence, confirming the correct tension before proceeding is a standard safety protocol to mitigate risks of accidents on the rail system.