Table 2.
Thermal boundary parameters incorporated in Eq. (13).
| Boundaries | (°C) | (°C) |
|---|---|---|
| Air | −4.5 | 11.5 |
| Natural ground surfaces | −0.52 | 12.0 |
| Sunny slope shoulder | 2.18 | 9.29 |
| Shady slope shoulder | −1.24 | 12.58 |
| Railway ballast | 2.0 | 15.0 |
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