Horizontal curvature for ELR STA 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 | Features |
|---|---|---|---|---|
| 13M 0476y - 13M 0550y | ⚪-⚪⚪⚪-⚪ | Straight | ||
| 13M 0550y - 13M 0660y | ⭕-🔴🔴🔴-🟡 | Very Tight (249 m) | 118 m → 956 m | West Drayton Jn |
| 13M 0660y - 13M 0770y | ⭕-⭕⭕⭕-🟠 | Extremely Tight (164 m) | 101 m → 574 m | |
| 13M 0770y - 13M 0880y | ⭕-⭕⭕⭕-🟠 | Extremely Tight (202 m) | 105 m → 495 m | |
| 13M 0880y - 13M 0990y | ⭕-⭕⭕⭕-⚪ | Extremely Tight (115 m) | <100 m → Straight | |
| 13M 0990y - 13M 1100y | ⭕-🟠🟠🟠-⚪ | Moderately Tight (501 m) | <100 m → Straight | |
| 13M 1100y - 13M 1210y | ⭕-🟣🟣🟣-⚪ | Moderate (1,265 m) | 142 m → Straight | |
| 13M 1210y - 13M 1320y | ⭕-🔴🔴🔴-⚪ | Very Tight (226 m) | 102 m → Straight | |
| 13M 1320y - 13M 1430y | ⭕-⭕⭕⭕-⚪ | Extremely Tight (202 m) | <100 m → Straight | |
| 13M 1430y - 13M 1540y | ⭕-⭕⭕⭕-⚪ | Extremely Tight (211 m) | <100 m → Straight | |
| 13M 1540y - 13M 1650y | ⭕-⭕⭕⭕-⚪ | Extremely Tight (213 m) | <100 m → Straight | |
| 13M 1650y - 14M 0000y | ⭕-🟠🟠🟠-⚪ | Moderately Tight (581 m) | <100 m → Straight | |
| 14M 0000y - 14M 0110y | 🟠-🟠🟠🟠-🟡 | Moderately Tight (649 m) | 472 m → 753 m | |
| 14M 0110y - 14M 0220y | 🔴-🟠🟠🟠-⚫ | Moderately Tight (626 m) | 268 m → 28,014 m | |
| 14M 0220y - 14M 0330y | 🔴-🟡🟡🟡-⚪ | Moderate (922 m) | 337 m → Straight | |
| 14M 0330y - 14M 0440y | 🟠-🟣🟣🟣-⚪ | Moderate (1,747 m) | 414 m → Straight | |
| 14M 0440y - 14M 0550y | 🟡-🟡🟡🟡-🟡 | Moderate (1,014 m) | ||
| 14M 0550y - 14M 0660y | ⚪-⚪⚪⚪-⚪ | Straight | ||
| 14M 0660y - 14M 0770y | 🔴-🟡🟡🟡-⚪ | Moderate (1,057 m) | 296 m → Straight | |
| 14M 0770y - 14M 0880y | 🟡-🟡🟡🟡-🟡 | Moderate (752 m) | ||
| 14M 0880y - 14M 0990y | 🟣-🟣🟣🟣-🟣 | Moderate (1,647 m) | ||
| 14M 0990y - 14M 1100y | 🟣-🟣🟣🟣-🟣 | Moderate (1,425 m) | ||
| 14M 1100y - 14M 1210y | ⚪-⚪⚪⚪-⚪ | Straight | ||
| 14M 1210y - 14M 1320y | 🟡-🟡🟡🟡-🟡 | Moderate (789 m) | ||
| 14M 1320y - 14M 1430y | 🟡-🟡🟡🟡-🟡 | Moderate (878 m) | ||
| 14M 1430y - 14M 1540y | ⚪-⚪⚪⚪-⚪ | Straight | ||
| 14M 1540y - 14M 1650y | 🔵-🔵🔵🔵-🔵 | Flat (3,789 m) | ||
| 14M 1650y - 15M 0000y | ⚪-⚪⚪⚪-⚪ | Straight | ||
| 15M 0000y - 15M 0110y | ⚪-⚪⚪⚪-⚪ | Straight | ||
| 15M 0110y - 15M 0220y | ⚪-⚪⚪⚪-⚪ | Straight | ||
| 15M 0220y - 15M 0330y | ⚪-⚪⚪⚪-⚪ | Straight | ||
| 15M 0330y - 15M 0440y | 🟢-🟢🟢🟢-🟢 | Very Flat (19,037 m) | ||
| 15M 0440y - 15M 0550y | ⚪-⚪⚪⚪-⚪ | Straight | ||
| 15M 0550y - 15M 0660y | 🟠-🟡🟡🟡-🟡 | Moderate (824 m) | 472 m → 1,233 m | |
| 15M 0660y - 15M 0770y | ⚪-⚪⚪⚪-⚪ | Straight | ||
| 15M 0770y - 15M 0880y | ⚪-⚪⚪⚪-⚪ | Straight | ||
| 15M 0880y - 15M 0990y | ⚪-⚪⚪⚪-⚪ | Straight | ||
| 15M 0990y - 15M 1100y | ⚪-⚪⚪⚪-⚪ | Straight | ||
| 15M 1100y - 15M 1210y | ⚪-⚪⚪⚪-⚪ | Straight | ||
| 15M 1210y - 15M 1320y | ⚪-⚪⚪⚪-⚪ | Straight | ||
| 15M 1320y - 15M 1430y | ⚪-⚪⚪⚪-⚪ | Straight | ||
| 15M 1430y - 15M 1540y | ⚪-⚪⚪⚪-⚪ | Straight | ||
| 15M 1540y - 15M 1650y | ⚪-⚪⚪⚪-⚪ | Straight | ||
| 15M 1650y - 16M 0000y | ⭕-🟡🟡🟡-⚪ | Moderate (833 m) | 192 m → Straight | |
| 16M 0000y - 16M 0110y | 🟠-🟠🟠🟠-🟠 | Moderately Tight (603 m) | ||
| 16M 0110y - 16M 0220y | ⚪-⚪⚪⚪-⚪ | Straight | ||
| 16M 0220y - 16M 0330y | 🟡-🟡🟡🟡-🟡 | Moderate (885 m) | ||
| 16M 0330y - 16M 0440y | ⭕-🟠🟠🟠-⚪ | Moderately Tight (560 m) | <100 m → Straight | |
| 16M 0440y - 16M 0550y | ⚪-⚪⚪⚪-⚪ | Straight | ||
| 16M 0550y - 16M 0639y | ⚪-⚪⚪⚪-⚪ | Straight |