Horizontal curvature for ELR NHM3 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 |
|---|---|---|---|
| 18M 0709y - 18M 0770y | ⚪-⚪⚪⚪-⚪ | Straight | Straight |
| 18M 0770y - 18M 0880y | ⭕-🔴🔴🔴-🟠 | Very Tight (266 m) | Extremely Tight (115 m) to Moderately Tight (558 m) |
| 18M 0880y - 18M 0990y | 🟠-🟠🟠🟠-🟢 | Moderately Tight (739 m) | Tight (382 m) to Very Flat (6,537 m) |
| 18M 0990y - 18M 1100y | ⚪-⚪⚪⚪-⚪ | Straight | Straight |
| 18M 1100y - 18M 1210y | 🔵-🔵🔵🔵-🔵 | Moderately Flat (2,142 m) | Moderately Flat (2,142 m) |
| 18M 1210y - 18M 1320y | ⚪-⚪⚪⚪-⚪ | Straight | Straight |
| 18M 1320y - 18M 1430y | ⭕-🟠🟠🟠-🔵 | Tight (370 m) | Extremely Tight (151 m) to Flat (3,527 m) |
| 18M 1430y - 18M 1471y | ⚪-⚪⚪⚪-⚪ | Straight | Straight |