Which of the following is part of the standard radio communications example?

• A. TDN 3300, Lilydale to Ringwood. Stopped at platform 1, Croydon
• B. TDN 3300, Ringwood to Lilydale. Stopped at platform 2, Croydon
• C. TDN 3300, Lilydale to Ringwood. Stopped at platform 1, Box Hill
• D. TDN 3400, Lilydale to Ringwood. Stopped at platform 1, Croydon

Answer: (A)

In standard radio communications, messages follow a fixed format that identifies the train, its route, and where it will stop. The best choice uses TDN 3300 and specifies Lilydale to Ringwood with a stop at Croydon on platform 1. This combination matches the typical sample pattern used in practice materials, where a specific Train Destination Number is paired with a clear origin–destination route and the exact platform of the stop.

The other options change one or more elements: the direction is reversed (Ringwood to Lilydale), the platform is different (platform 2), a different station is listed (Box Hill), or a different TDN is used (3400). These deviations mean they don’t align with the standard example.