Horizontal curvature for ELR BTC 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 |
|---|---|---|---|
| 7M 0286y - 7M 0330y | ⚪-⚪⚪⚪-⚪ | Straight | Straight |
| 7M 0330y - 7M 0440y | 🟠-🟠🟠🟠-🟠 | Moderately Tight (542 m) | Tight (444 m) to Moderately Tight (646 m) |
| 7M 0440y - 7M 0550y | 🟠-🟠🟠🟠-🟠 | Tight (484 m) | Tight (373 m) to Moderately Tight (614 m) |
| 7M 0550y - 7M 0660y | 🟠-🟠🟠🟠-🟠 | Moderately Tight (638 m) | Moderately Tight (605 m to 698 m) |
| 7M 0660y - 7M 0770y | 🟠-🟠🟠🟠-🟠 | Tight (428 m) | Tight (428 m) |
| 7M 0770y - 7M 0880y | 🟠-🟠🟠🟠-🟠 | Tight (490 m) | Tight (490 m) |
| 7M 0880y - 7M 0990y | 🔴-🟠🟠🟠-🟠 | Tight (392 m) | Very Tight (228 m) to Moderately Tight (592 m) |
| 7M 0990y - 7M 1100y | 🔵-🔵🔵🔵-🔵 | Flat (3,261 m) | Flat (3,261 m) |
| 7M 1100y - 7M 1210y | 🟠-🟠🟠🟠-🟠 | Moderately Tight (523 m) | Moderately Tight (500 m to 542 m) |
| 7M 1210y - 7M 1320y | ⚪-⚪⚪⚪-⚪ | Straight | Straight |
| 7M 1320y - 7M 1430y | 🔵-🔵🔵🔵-🔵 | Flat (4,008 m) | Flat (4,008 m) |
| 7M 1430y - 7M 1540y | ⚪-⚪⚪⚪-⚪ | Straight | Straight |
| 7M 1540y - 7M 1650y | ⚪-⚪⚪⚪-⚪ | Straight | Straight |
| 7M 1650y - 8M 0000y | ⚪-⚪⚪⚪-⚪ | Straight | Straight |
| 8M 0000y - 8M 0110y | 🟢-🟢🟢🟢-🟢 | Very Flat (19,718 m) | Very Flat (19,718 m) |
| 8M 0110y - 8M 0220y | ⚪-⚪⚪⚪-⚪ | Straight | Straight |
| 8M 0220y - 8M 0330y | ⚫-⚫⚫⚫-⚫ | Extremely Flat (49,555 m) | Extremely Flat (49,555 m) |
| 8M 0330y - 8M 0440y | ⚫-⚫⚫⚫-⚫ | Extremely Flat (20,152 m) | Extremely Flat (20,152 m) |
| 8M 0440y - 8M 0550y | 🟡-🟡🟡🟡-🟡 | Moderate (1,232 m) | Moderate (1,232 m) |
| 8M 0550y - 8M 0660y | 🟠-🟠🟠🟠-🟠 | Moderately Tight (561 m) | Moderately Tight (559 m to 563 m) |
| 8M 0660y - 8M 0770y | 🟠-🟠🟠🟠-🟠 | Moderately Tight (583 m) | Moderately Tight (520 m to 648 m) |
| 8M 0770y - 8M 0880y | 🟠-🟠🟠🟠-🟠 | Tight (496 m) | Tight (425 m) to Moderately Tight (559 m) |
| 8M 0880y - 8M 0990y | 🟠-🟠🟠🟠-🟠 | Moderately Tight (611 m) | Moderately Tight (508 m to 688 m) |
| 8M 0990y - 8M 1100y | ⭕-🟠🟠🟠-⚪ | Moderately Tight (582 m) | Extremely Tight (179 m) to Straight |
| 8M 1100y - 8M 1210y | 🟠-🟡🟡🟡-🟢 | Moderate (1,213 m) | Tight (472 m) to Very Flat (5,109 m) |
| 8M 1210y - 8M 1320y | 🔴-🟠🟠🟠-🔵 | Moderately Tight (595 m) | Very Tight (230 m) to Flat (3,216 m) |
| 8M 1320y - 8M 1430y | 🔴-🟣🟣🟣-🟢 | Moderate (1,614 m) | Very Tight (262 m) to Very Flat (10,501 m) |
| 8M 1430y - 8M 1540y | ⭕-🟠🟠🟠-🟡 | Tight (464 m) | Extremely Tight (225 m) to Moderate (795 m) |
| 8M 1540y - 8M 1639y | 🟡-🟡🟡🟡-🟡 | Moderate (1,131 m) | Moderate (1,131 m) |