Which tool would you use to measure superelevation?

The cross level tool is specifically designed for measuring the cross-level of track geometry, which includes superelevation. Superelevation refers to the banking of the track on curves, allowing trains to maintain speed safely while navigating curves. The tool helps ensure that the elevation difference between the two rails on a curve is accurate, thereby promoting safe and efficient train operation.

The other tools mentioned do not provide the precision or the specific measurement required for superelevation. A speedometer measures the speed of the train but does not gauge track curvature. A measuring tape can measure distances or heights but lacks the specificity for measuring the inclination of the track. A protractor could measure angles, but it is not typically used in railway applications to assess superelevation directly. Thus, the cross level tool is the most appropriate and effective choice for this specific measurement.