Who is permitted to operate the engine while in training?

The correct choice indicates that a student engineer under supervision is the individual permitted to operate the engine while in training. This policy ensures that the operation of the engine is conducted safely and effectively, as student engineers are specifically trained and evaluated by certified personnel during their learning process. Having a qualified instructor or supervising engineer present allows for immediate guidance, feedback, and support, which is crucial when a student is learning to manage the complexities of locomotive operation.

This approach emphasizes the importance of safety, knowledge, and skill development in the training program, allowing the student to gain practical, hands-on experience while ensuring that a trained professional is present to mitigate risks.