Employees operating switches and derails by hand must visually ensure:

The correct answer is comprehensive, as it includes multiple critical safety checks that employees must perform when operating switches and derails by hand.

Firstly, wearing the correct safety equipment is essential because it protects employees from potential hazards in the rail yard and enhances their safety while performing their duties. Proper gear ensures that they are equipped to handle various situations, especially in environments where physical injuries could occur.

Secondly, ensuring that the switch points fit up properly is vital for safe train operations. If the switch points do not align correctly, it could lead to derailments or accidents, posing significant risks to both personnel and equipment.

Lastly, verifying that the switches and derails correspond with the target position is crucial for ensuring that trains are directed safely along their intended routes. This check helps prevent accidents caused by trains incorrectly navigating the switch points.

By encompassing all these factors, the correct answer emphasizes a thorough approach to safety in the operation of switches and derails. Each aspect is interconnected and equally important for maintaining a safe and efficient work environment on the railroad.