Figure 5
The vertical axis is labeled “Train Number,” ranging from 15 to 23 in increments of 2. The horizontal axis is labeled “Cases,” ranging from 1 to 20 in increments of 1. The “Case F O” curve, a solid line with circular markers, starts at (1, 20), shows a steady pattern until (5, 20), falls slightly to (6, 19), rises sharply to a peak at (7, 22), then drops again to (8, 20). It remains nearly stable with minor fluctuations between (11, 20) and (15, 20), maintains a steady trend until (19, 20), and ends with a small rise near (20, 21). The “Case N F O” curve, a solid line in a different color with circular markers, begins at (1, 20), falls gradually to (2, 19), rises again around (3, 20), and then shows several minor rises and falls between (4, 18) and (18, 19) before ending near (20, 19). Note: All numerical data values are approximated.Train Number Change of the Case FO and NFO. Source: Author’s own work