How should the deck of locomotives be protected from loose material in the track entry?

Using shields to protect the deck of locomotives from loose material in the track entry is an effective strategy because shields are specifically designed to deflect or block potential hazards. In a railway context, they can provide a physical barrier that prevents debris from contacting critical components of the locomotives, thereby minimizing the risk of damage or malfunction.

Shields can be constructed from various materials that can withstand the impacts associated with loose track materials, including rocks, dirt, or other debris. This form of protection is crucial in maintaining the safety and operational integrity of the locomotives as they navigate entrances where loose materials are likely to be present.

While other options such as nets, barriers, and warnings can have their merits, they serve different purposes or may not provide the same level of protection as shields. For instance, nets may not catch heavier debris effectively, barriers might not be feasible in certain track designs, and warnings, although important for awareness, do not offer any physical protection. Thus, shields are the most direct and robust means to safeguard locomotives in this context.