Define 'consist' in railway terminology.

In railway terminology, 'consist' refers specifically to the arrangement of cars and locomotives that make up a train. This includes not only the configuration but also the order in which different types of cars (such as freight, passenger, or specialized equipment) and locomotives are placed. Understanding the consist is crucial for a locomotive engineer, as it impacts train handling characteristics, weight distribution, and overall safety.

The other options describe different aspects of railway operations but do not capture the precise meaning of 'consist'. For example, while a type of locomotive and the capacity for passengers are important components of train functionality, they do not encompass the broader concept of how a train is organized from front to back. The schedule of a train's journey refers to timing and routing rather than how the train is constructed visually and operationally. Thus, the selection of consist as the correct definition accurately reflects its role in rail operations and engineering.