Main North Line Tunnel 21

Key Client: 
KiwiRail
Location: 
Main North Line - Between Kaikoura and Blenheim
Project Scope: 

Tunnel 21 was spatial surveyed and designed including new track alignment.

Vitruvius surveyed the track alignment and inside of the tunnel using laser scanning technology to produce a 3d model for the track design.

Using KiwiRail rolling stock data a full spatial assessment of the tunnel was completed based on the types of rail vehicle in use on the Midland line. This spatial assessment was the base for Vitruvius’s designers to create a new track alignment to KiwiRail’s standards and optimising the tunnel clearances.

The design was backed up with Vitruvius survey team monumenting the design with datum plaques every 10m on the tunnel lining.