In what position is the ATC Mode switch normally set in yard territory?

The correct answer is the setting of the ATC Mode switch to MCS, which stands for "Mode Control Switch." In yard territory, the MCS position is generally used because it ensures that the Automatic Train Control (ATC) system is active during movements where trains operate in less restrictive conditions than on mainline track. The MCS position allows for appropriate speed control and safety measures while operating within yard limits, where higher speeds and more complex movements occur.

This setting helps maintain operational safety as trains are shuffling, switching, or interacting with other rail cars and equipment in the yard environment. Proper adherence to ATC protocols with the switch set to MCS ensures that trains are monitored effectively, enabling timely responses to any operational changes or hazards that may arise in such settings.