wagon on a wheel. Over 96% of the wheels created
impact forces less than 50kN. The bulk of the graph
in Figure 2 therefore, is comprised of only the
remaining 4% of wheels. However, that small
percentage still comprised over 100,000 wheels
throughout the year of the study, and they caused
impact forces as high as 310kN. The sloping dashed
line in the plot represents a line of best fit to the
data for these 100,000 wheel forces.