When measuring track compliance, it must be measured as if it were __________?

When measuring track compliance, it is essential to do so as if it were under load to accurately reflect the behavior and performance of the track under operational conditions. This measurement takes into account how the track will respond when weight is applied, which is crucial for understanding its structural integrity, stability, and overall performance during actual use.

Measuring compliance under load provides insights into the track's elasticity and how it supports rolling stock, enabling engineers and maintenance teams to identify potential issues that could arise during operation. Such a methodology ensures that the assessments are realistic and relevant, leading to more accurate maintenance planning and safety evaluations.