Final Answer:
When operating trains in yards, train operators are instructed to operate from a standing position because, from this position, it is easier to observe the surroundings and communicate with ground personnel.
Step-by-step explanation:
Operating trains from a standing position in yards provides several advantages. Firstly, the elevated vantage point from the standing position allows train operators to have a better view of the surroundings, including the tracks, switches, and potential obstacles. This enhanced visibility is crucial for ensuring safe and efficient movement within the yard, minimizing the risk of collisions or derailments.
Secondly, being in a standing position facilitates improved communication with ground personnel. Train operators can more effectively convey signals, instructions, or information to personnel on the ground. This clear communication is essential for coordinating various tasks, such as coupling and uncoupling cars, aligning switches, and ensuring the overall safety of yard operations.