If a train is 665 meters long, what is the required holding test time?

The required holding test time for a train is generally calculated based on the length of the train and specific industry standards, which often equate the length of the train in meters to minutes of holding time. In this case, with a train length of 665 meters, the calculation for the holding test time follows an established formula or guideline that dictates how long the train must be held to ensure safety protocols are met.

Based on typical guidelines, holding time may be determined such that every 100 meters of train length corresponds to a minute of holding time. For a train that is 665 meters long, this would usually translate to holding time close to 31 minutes when using the standard measurement. Such standardized practices are in place to ensure operational safety, reliability, and compliance with regulations.

Therefore, the most appropriate choice for the holding test time given the length of the train is indeed 31 minutes, reflecting the calculation that aligns with safety protocols and requirements in New South Wales rail operations.