Which of the following is not a factor in calculating unbalance?

In the context of calculating unbalance in railway engineering, the factor that does not typically influence the calculation is the height of the track. Unbalance is primarily affected by factors related to the curvature of the track, the speed of the train, and the length of the railway section.

The degree of curve is crucial because it directly affects the lateral forces acting on the train as it navigates turns. As the curvature increases, the unbalance increases, requiring careful consideration for safe operation.

Train speed is another critical factor since higher speeds lead to greater centrifugal forces acting on the train, which in turn impact the unbalance experienced. The interaction of speed with curvature can increase the likelihood of discomfort for passengers and stress on the tracks.

The length of the railway section is relevant because it influences the distribution of forces along the track and can impact how quickly the train can respond to curves or changes in gradient, which in turn affects stability and balance.

In contrast, the height of the track does not have a direct influence on these dynamic forces or their calculations. It does play a role in considerations like clearance and structural integrity but does not alter the way unbalance is assessed. Therefore, it is the correct choice as the factor that is not considered in calculating unbalance