Horizontal curvature for ELR ECA3 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 |
|---|---|---|---|---|
| 98M 1747y - 99M 0000y | ⚪-⚪⚪⚪-⚪ | Straight | SLATEFORD | |
| 99M 0000y - 99M 0110y | 🟡-🟢🟢🟢-⚪ | Very Flat (7,998 m) | 891 m → Straight | SLATEFORD; Slateford Jn |
| 99M 0110y - 99M 0220y | 🟢-🟢🟢🟢-🟢 | Very Flat (14,551 m) | ||
| 99M 0220y - 99M 0330y | ⚪-⚪⚪⚪-⚪ | Straight | ||
| 99M 0330y - 99M 0440y | ⚪-⚪⚪⚪-⚪ | Straight | ||
| 99M 0440y - 99M 0550y | 🟢-🟢🟢🟢-🟢 | Very Flat (11,656 m) | ||
| 99M 0550y - 99M 0660y | 🟠-🟡🟡🟡-🟢 | Moderate (1,112 m) | 650 m → 6,066 m | |
| 99M 0660y - 99M 0770y | 🟠-🟠🟠🟠-🟡 | Moderately Tight (638 m) | 532 m → 842 m | |
| 99M 0770y - 99M 0880y | 🟠-🟠🟠🟠-🟡 | Moderately Tight (734 m) | 563 m → 936 m | SUB2 intersection |
| 99M 0880y - 99M 0990y | 🟠-🟠🟠🟠-🟡 | Moderately Tight (671 m) | 565 m → 801 m | |
| 99M 0990y - 99M 1100y | 🔴-🟠🟠🟠-🟣 | Moderately Tight (630 m) | 336 m → 1,287 m | |
| 99M 1100y - 99M 1210y | 🟡-🟣🟣🟣-🟢 | Moderate (1,838 m) | 989 m → 13,816 m | |
| 99M 1210y - 99M 1320y | 🟠-🟡🟡🟡-🟣 | Moderate (1,171 m) | 705 m → 1,806 m | |
| 99M 1320y - 99M 1430y | 🟣-🟣🟣🟣-🟣 | Moderate (1,323 m) | 1,313 m → 1,334 m | |
| 99M 1430y - 99M 1540y | 🟡-🟡🟡🟡-🟡 | Moderate (1,031 m) | 826 m → 1,240 m | |
| 99M 1540y - 99M 1650y | 🟠-🟣🟣🟣-🟢 | Moderate (1,432 m) | 735 m → 7,574 m | |
| 99M 1650y - 100M 0000y | 🟠-🟡🟡🟡-🔵 | Moderate (998 m) | 620 m → 2,705 m | |
| 100M 0000y - 100M 0110y | 🟢-🟢🟢🟢-🟢 | Very Flat (15,219 m) | ||
| 100M 0110y - 100M 0220y | ⚪-⚪⚪⚪-⚪ | Straight | ||
| 100M 0220y - 100M 0330y | ⚪-⚪⚪⚪-⚪ | Straight | former Granton Jn | |
| 100M 0330y - 100M 0440y | 🟠-🟣🟣🟣-🔵 | Moderate (1,371 m) | 688 m → 3,642 m | |
| 100M 0440y - 100M 0550y | 🔴-🟠🟠🟠-⚪ | Tight (465 m) | 280 m → Straight | |
| 100M 0550y - 100M 0660y | ⭕-🔴🔴🔴-🟠 | Very Tight (347 m) | 172 m → 577 m | |
| 100M 0660y - 100M 0770y | 🔴-🟠🟠🟠-🟠 | Tight (380 m) | 269 m → 577 m | |
| 100M 0770y - 100M 0880y | 🟠-🟡🟡🟡-⚪ | Moderate (773 m) | 369 m → Straight | |
| 100M 0880y - 100M 0990y | ⚪-⚪⚪⚪-⚪ | Straight | Haymarket East Jn | |
| 100M 0990y - 100M 1084y | ⚪-⚪⚪⚪-⚪ | Straight |