In which mode does the train operate within the Yard under the train engineer's control?

The train operates in Yard mode while within the Yard under the train engineer's control because this mode is specifically designed for operations that take place in a yard setting. In Yard mode, certain operational controls and systems are adjusted to prioritize safety and efficiency in a more confined space where trains are typically doing activities like switching tracks, assembling or disassembling cars, and loading or unloading cargo.

This mode is tailored for handling the unique tasks that occur in a yard environment, which is different from the more routine operations of a train running on mainline routes. By operating in Yard mode, engineers have the control necessary to manage slower speeds, tighter turns, and increased awareness of surrounding movements, making it the most appropriate choice for activities performed in the yard.