Horizontal curvature for ELR SDP is based on the digitised notional centre-line, calculated in 100 metre sections. The average radius computation is weighted, however this should be treated as indicative only. The computed minimum and maximum radii are shown for completeness, and often report a much tighter radius than the physical railway. Radii calculations are influenced by the digitisation quality, and often produce inaccurate values at the extremities of the ELR, areas of tracks divergence, and locations of very tight curvature.
| Mileage | Schematic | Average Radius | Radius Range |
|---|---|---|---|
| 77M 0079y - 77M 0110y | ⚪-⚪⚪⚪-⚪ | Straight | Straight |
| 77M 0110y - 77M 0220y | ⭕-⭕⭕⭕-⚪ | Extremely Tight (207 m) | Extremely Tight (<100 m) to Straight |
| 77M 0220y - 77M 0330y | 🟡-🟣🟣🟣-🔵 | Moderate (1,293 m) | Moderate (1,118 m) to Flat (3,096 m) |
| 77M 0330y - 77M 0440y | 🟠-🟠🟠🟠-🟠 | Moderately Tight (551 m) | Tight (487 m) to Moderately Tight (653 m) |
| 77M 0440y - 77M 0550y | ⭕-🟠🟠🟠-⚪ | Tight (434 m) | Extremely Tight (<100 m) to Straight |
| 77M 0550y - 77M 0660y | 🔴-🟠🟠🟠-🟠 | Tight (404 m) | Very Tight (268 m) to Moderately Tight (591 m) |
| 77M 0660y - 77M 0770y | ⭕-🔴🔴🔴-⚪ | Very Tight (288 m) | Extremely Tight (<100 m) to Straight |
| 77M 0770y - 77M 0880y | ⭕-⭕⭕⭕-⭕ | Extremely Tight (137 m) | Extremely Tight (<100 m to 214 m) |
| 77M 0880y - 77M 0990y | ⚪-⚪⚪⚪-⚪ | Straight | Straight |
| 77M 0990y - 77M 1088y | ⚪-⚪⚪⚪-⚪ | Straight | Straight |