What term is used for a train that is operated solely within a train yard or service area?

The term "Light Engine" refers to a locomotive that operates without any cars attached and is typically used within a train yard or service area. This type of movement is essential for various tasks such as moving engines to maintenance facilities, preparing them for service, or repositioning them for other functions within the yard.

Understanding the context in which a Light Engine operates is significant. It highlights the flexibility and operational strategies within train yards. Unlike freight trains, which are designed to transport cargo over long distances, or deadhead trains, which often involve crew positioning or non-revenue service, a Light Engine specifically denotes a locomotive engaged solely in activities that do not involve carrying passengers or freight but still play a pivotal role in train yard operations.

Recognizing the function of a Light Engine not only helps in defining it accurately but also in appreciating the critical movement and logistical planning required in train yard management.