Which format correctly conveys a track restriction directly to a train?

• A. (train ID) do not exceed (speed) between (location) and (location)
• B. Do not exceed (speed) for train (train ID) between (location) and (location)
• C. (train ID) do not exceed (speed) between (start) and (end)
• D. The train (train ID) must slow to (speed) between (location) and (location)

Answer: (A)

Directly addressing the train with a precise speed restriction for a defined segment is how a track restriction is communicated. The best format starts with the train ID, then the direct command “do not exceed” a certain speed, and finishes with the boundaries “between” two locations. This structure makes exactly who must obey, what limit applies, and where it applies crystal clear, leaving no room for misinterpretation in busy, time-critical operations.

The other phrasings are less precise for a couple of reasons. Using a formulation like “for train” can feel awkward and doesn’t place the instruction squarely on the intended train, which can create ambiguity in fast-moving traffic. Referencing endpoints as “start” and “end” is less consistent with standard location-referencing practices, which can lead to confusion when cross-checking against other instructions. And phrasing that uses “must slow to” shifts the emphasis from a hard maximum to a recommended action, which can be interpreted differently in practice.