Horizontal curvature for ELR BHI1 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 |
|---|---|---|---|
| 156M 1178y - 156M 1210y | ⚪-⚪⚪⚪-⚪ | Straight | Straight |
| 156M 1210y - 156M 1320y | 🟣-🔵🔵🔵-🟢 | Flat (4,979 m) | Moderate (1,888 m) to Very Flat (17,225 m) |
| 156M 1320y - 156M 1430y | 🟠-🟡🟡🟡-🟣 | Moderate (760 m) | Tight (475 m) to Moderate (1,877 m) |
| 156M 1430y - 156M 1540y | 🟡-🟡🟡🟡-🔵 | Moderate (1,104 m) | Moderate (758 m) to Moderately Flat (2,266 m) |
| 156M 1540y - 156M 1650y | 🟡-🟡🟡🟡-🟡 | Moderate (878 m) | Moderate (806 m to 1,085 m) |
| 156M 1650y - 157M 0000y | ⭕-🔴🔴🔴-🟠 | Very Tight (318 m) | Extremely Tight (161 m) to Moderately Tight (626 m) |
| 157M 0000y - 157M 0110y | ⭕-🔴🔴🔴-🟣 | Very Tight (281 m) | Extremely Tight (138 m) to Moderate (1,479 m) |
| 157M 0110y - 157M 0220y | 🔴-🟡🟡🟡-🟢 | Moderate (820 m) | Very Tight (228 m) to Very Flat (5,453 m) |
| 157M 0220y - 157M 0330y | ⭕-🔴🔴🔴-🟠 | Very Tight (239 m) | Extremely Tight (101 m) to Moderately Tight (676 m) |
| 157M 0330y - 157M 0440y | ⭕-🔴🔴🔴-🔵 | Very Tight (242 m) | Extremely Tight (108 m) to Moderately Flat (2,692 m) |
| 157M 0440y - 157M 0550y | ⭕-🟠🟠🟠-🟢 | Tight (381 m) | Extremely Tight (133 m) to Very Flat (8,633 m) |
| 157M 0550y - 157M 0660y | ⭕-🟡🟡🟡-🟢 | Moderate (920 m) | Extremely Tight (187 m) to Very Flat (6,030 m) |
| 157M 0660y - 157M 0670y | ⚪-⚪⚪⚪-⚪ | Straight | Straight |