{
  "inner_radius_max_dev_m": 8.881784197001252e-16,
  "lining_thickness_crown_m": 0.3,
  "crown_above_road_m (expect 6.615 at S=0 station 5000)": 6.615,
  "road_z_4745_m": 50.62,
  "road_z_5480_m": 67.311,
  "plan_chord_length_total_m (4+700..5+500)": 799.905,
  "station_range_modelled": "4745 .. 5480 (ring step 5.0 m, 148 rings)",
  "glb_bytes": 470416,
  "glb_reload_geometries": 5
}