Figure 17
The figure has two panels labeled “Left wheel‑rail” on the left and “Right wheel‑rail” on the right, each with matching axes and legend style. The horizontal axis in both panels is labeled “Working condition” and lists six categories from left to right: “50 kilometers per hour, R 300 meters”, “80 kilometers per hour, R 400 meters”, “100 kilometers per hour, R 500 meters”, “60 kilometers per hour, R 800 meters”, “160 kilometers per hour, R 1300 meters”, “200 kilometers per hour, R 2000 meters”, and “Straight 80 kilometers per hour”. The vertical axis in both panels is labeled “Equivalent continuous A‑weighted sound pressure level, decibels (A)” and ranges from 70 to 110 with an interval of 5. Each working condition is represented by a tall, hatched bar with a line and square markers connecting the bar tops to indicate the trend. In the left wheel‑rail panel, the bar tops with square markers have the values “50 kilometers per hour, R 300 meters”: 104; “80 kilometers per hour, R 400 meters”: 107; “100 kilometers per hour, R 500 meters”: 105; “60 kilometers per hour, R 800 meters”: 103.5; “160 kilometers per hour, R 1300 meters”: 95; “200 kilometers per hour, R 2000 meters”: 95.5; and “Straight 80 kilometers per hour”: 94. In the right wheel‑rail panel, the bar tops with square markers have the values “50 kilometers per hour, R 300 meters”: 101.5; “80 kilometers per hour, R 400 meters”: 104; “100 kilometers per hour, R 500 meters”: 102.5; “60 kilometers per hour, R 800 meters”: 101; “160 kilometers per hour, R 1300 meters”: 95; “200 kilometers per hour, R 2000 meters”: 95; and “Straight 80 kilometers per hour”: 92.5. Note: All the numerical data values are approximated.Comparison of results under different working conditions. Source: Authors’ own work