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In the context of key machines, 'Carriage' refers to the assembly that supports the key vise, which is the component that holds the key securely in place during the cutting process. This part is crucial for ensuring accuracy and precision while the key is being cut, as it stabilizes the key and allows for controlled movements of the cutting tool. Without a proper carriage, the process of duplicating or cutting keys would be prone to errors, leading to poorly cut keys that may not function correctly in locks.

The other options pertain to parts or functions that do not directly influence the cutting process as much as the carriage does. For example, a storage compartment for keys would not be involved in the actual key cutting, while the motor is necessary for the machine's operation but does not support the key itself. Similarly, the display panel, while useful for monitoring settings or progress, does not have a role in how the key is held during the cutting procedure. Understanding the function of each component helps in grasping the overall operation of a key machine.