WMUWellington Metro Upgradechainage tolerance ±10 mm
Running lines2 tracks · 2 switches · 1 branches
Hutt Valley LineSL · Single Line2.3 MGTLP1 · Western Hutt Passing Loop0.8 MGT0.0 km0.6 km1.3 km1.9 km2.6 km3.2 km

Melling Line

SL · Single Line3.198 km · 2.3 MGT/yr on this running line · 42 services/weekday · run 2026-06-18
map data © OpenStreetMap contributors (ODbL) — tiles © CARTO
click the alignment to move the chainage cursor · 1.599 km
1Measured data
2Analysis overlay
3Work history
5Planned work
Chainage10 mm grid
0.0
0.5
1.0
1.5
2.0
2.5
3.0
Petone
Melling Junction
Western Hutt
Melling
Top 35 m SD
mm · 3 runs to 2026-06-18
Twist 3 m SD
mm · 3 runs to 2026-06-18
Alignment 35 m SD
mm · 3 runs to 2026-06-18
Gauge deviation
mm · 3 runs to 2026-06-18
RCF eddy current depth
mm · 3 runs to 2026-06-18
Rail head loss
mm · 3 runs to 2026-06-18
Rail side wear
mm · 3 runs to 2026-06-18
Ultrasonic crack — rail head
% head · 3 runs to 2026-06-18
Ultrasonic crack — rail foot
% foot · 3 runs to 2026-06-18
GPR ballast fouling index
% · 3 runs to 2026-06-18
Utilisation (MGT/yr)
MGT · 1 runs to 2026-06-18
OLE contact wire height
mm above TOR · 3 runs to 2026-06-18
OLE contact wire stagger
mm from centreline · 3 runs to 2026-06-18
OLE contact wire residual thickness
mm · 3 runs to 2026-06-18
OLE contact wire wear
% section loss · 3 runs to 2026-06-18
Structures
6 features
Switches & crossings
3 features
Level crossings
1 features
Geotechnical risk
2 features
Drainage assets
4 features
Ultrasonic defects
2 features
Overhead line equipment
2 features
Track geometry exceedance
1 flagged lengths
Fouling, drainage and geometry correlation
1 flagged lengths
Tamping efficiency exhausted
1 flagged lengths
Work history
9 records
Planned work
1 planned items
TAMP
TAMP
TAMP
TAMP
RAIL
RAIL
MEL-BLK-03
1.599 km

Scroll to zoom about the cursor · drag to pan · every band shares one 10 mm-aligned chainage axis