Horizontal curvature for ELR GSJ1 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 |
|---|---|---|---|---|
| 3M 1251y - 3M 1320y | ⚪-⚪⚪⚪-⚪ | Straight | ||
| 3M 1320y - 3M 1430y | 🟣-🟣🟣🟣-🟣 | Moderate (1,761 m) | 1,525 m → 1,855 m | Galton Jn |
| 3M 1430y - 3M 1540y | 🟠-🟠🟠🟠-🟠 | Moderately Tight (631 m) | 535 m → 727 m | Galton Jn |
| 3M 1540y - 3M 1650y | 🔴-🔴🔴🔴-🔴 | Very Tight (282 m) | 239 m → 342 m | Galton Tunnel |
| 3M 1650y - 4M 0000y | 🔴-🟠🟠🟠-🟠 | Tight (387 m) | 302 m → 484 m | Galton Tunnel |
| 4M 0000y - 4M 0110y | ⭕-🔴🔴🔴-🔵 | Very Tight (237 m) | 137 m → 4,585 m | |
| 4M 0110y - 4M 0184y | 🔴-🟠🟠🟠-⚪ | Moderately Tight (661 m) | 318 m → Straight | Smethwick Jn |