Figure 4
A scatter plot represents the relationship between the length of railway track in kilometers and speed in kilometers per hour. The horizontal axis represents the length of railway track in kilometers, ranging from 0 to 40. The vertical axis represents speed in kilometers per hour, ranging from 0 to 70. The plot includes hundreds of data points, showing the true values of speed for different lengths of railway tracks. Three lines are plotted: a red line for KAN with an R-squared value of 0.288, a blue line for Linear regression with an R-squared value of 0.201, and an orange line for gplearn with an R-squared value of 0.270. The data points are scattered with some visible clusters and patterns, indicating a general trend of increasing speed with the length of the railway track. The KAN and gplearn lines show a more curved relationship compared to the linear regression line.Response surface of linear regression trained on two features: average speed as a function of block-section length (x2) and share of transit trains (x1)