When does the authority from a track warrant extend based on a designated first named point?

The authority from a track warrant extends from the station sign when there is no siding present, making it the correct choice. This means that the starting point of the authority is defined specifically at the station sign, ensuring that the train dispatcher and the train crew have a clear reference point for the limits of the warrant. This is particularly important in scenarios where the track arrangement does not include sidings, providing a straightforward and unambiguous starting location.

Understanding this concept is essential in ensuring the safe and orderly movement of trains. The station sign serves as a clear landmark that both crews and dispatchers recognize, helping to prevent any potential confusion regarding track authorization. In contrast, starting the authority from other points, such as a turnout switch or a signal, could introduce complications or misunderstandings about the authority's scope, especially in areas with more complex track configurations.