Horizontal curvature for ELR NHB 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 |
|---|---|---|---|
| 56M 1220y - 56M 1320y |  🟠-🟠🟠🟠-🟡 | Tight (439 m) | Tight (375 m) to Moderate (901 m) |
| 56M 1320y - 56M 1430y |  â•-🔴🔴🔴-🔵 | Very Tight (319 m) | Extremely Tight (<100 m) to Moderately Flat (2,776 m) |
| 56M 1430y - 56M 1540y |  🔵-🔵🔵🔵-🔵 | Moderately Flat (2,040 m) | Moderately Flat (2,040 m) |
| 56M 1540y - 56M 1650y |  🔵-🟢🟢🟢-🟢 | Very Flat (5,637 m) | Flat (3,104 m) to Very Flat (16,327 m) |
| 56M 1650y - 57M 0000y |  â•-â•â•â•-🟣 | Extremely Tight (162 m) | Extremely Tight (<100 m) to Moderate (1,521 m) |
| 57M 0000y - 57M 0110y |  â•-â•â•â•-🔴 | Extremely Tight (172 m) | Extremely Tight (132 m) to Very Tight (314 m) |
| 57M 0110y - 57M 0220y |  🔴-🟠🟠🟠-⚪ | Moderately Tight (630 m) | Very Tight (258 m) to Straight |
| 57M 0220y - 57M 0271y |  🟣-🟣🟣🟣-🟣 | Moderate (1,471 m) | Moderate (1,471 m) |