According to rule 1.10, what must employees on duty refrain from doing?

Employees on duty must refrain from playing games or reading unrelated literature because such activities can distract them from their responsibilities and the critical tasks at hand. Rule 1.10 emphasizes the importance of maintaining focus and alertness while on duty, ensuring that employees can respond promptly to any situations that may arise. Engaging in activities that are not directly related to their work compromises their ability to stay attentive and perform their duties effectively, which is essential for maintaining safety and operational efficiency in the maintenance of way operations. The other options either do not align with the essence of this rule or pertain to specific operational procedures that may not reflect the broader need for vigilance and concentration in the workplace.