What is a "train order" in railroad operations?

A "train order" refers specifically to written instructions provided to train crews regarding train movements and operations. This document serves as an essential tool for ensuring safety and coordination on the railway, detailing specific directives that may include aspects like timetables, track changes, or instructions to take various actions at junctions or during emergencies.

The significance of a train order lies in its role in maintaining orderly and safe operations in a system where multiple trains may be using the same track network. It directly addresses the operational needs of the railroad to manage traffic effectively and ensures that all crews are informed of the necessary actions to take at any given time. In contrast, the other choices do not encapsulate this critical function: schedule adjustments do not equate to specific movement instructions; personal messages and weather updates do not provide information related to train operations.