KiwiRail is undertaking a major upgrade of the Auckland rail network over the next few years, in preparation for the opening of the City Rail Link.
The City Rail Link (CRL) will allow even more frequent and convenient electric commuter trains across the city.
However, to deliver these benefits work needs to be done to remove temporary speed restrictions and raise the existing network up to a modern metro standard.
With funding from Waka Kotahi, KiwiRail has developed a programme of work – the Rail Network Rebuild - which is focussed on replacing the foundations under the tracks. We are also improving drainage in the rail corridor, to limit disruption from weather events.
This work will result in more reliable and smoother train rides across the city and is crucial to allow faster and more frequent trains, to come with CRL.
Carrying out significant work like this on a live network that operates 24/7 is extremely difficult. For example, if we were to do only this work in our current evening and weekend maintenance windows, it would take almost two decades to complete.
To get the majority of the work done before CRL opens, KiwiRail and Auckland Transport have made the difficult decision to close some rail lines, or sections of line, to electric commuter trains while this work is undertaken.
Find out where our teams are working and what we are doing here.
Stage 3 involves work on the Western Line and the Southern Line.
Construction work is complete on the Western Line Stage 3a work and trains have returned to their normal frequency. Essential track work, including de-stressing rails, is being completed overnight during coming weeks.
Stage 3b on the Southern Line resumes in the Papakura area on 28 April and will finish by 16 May.
The work is complicated and there is disruption as we undertake this crucial work - however it has been much less than that experienced by Auckland commuters in previous stages.
Alternative transport options are being provided.
Frequently Asked Questions for Stage 3 can be found here.
From May to mid-January 2025, full upgrade and renewals works while the line remains closed for electrification. By delaying reopening the line to trains for a short time, major disruption at a later date is avoided.
Work for Stage 2 on the Eastern Line included:
The Rail Network Rebuild is challenging:
Wherever possible we’ll also do proactive maintenance – such as replacing sleepers and trimming vegetation that would otherwise need to be dealt with in the coming years – and using the line closures to complete other rail related projects.
All railways require ongoing maintenance but we are thinking ahead and trying to avoid the need to come back and cause further disruption in the years ahead.
These photos illustrate some of the different types of work that go into the Rail Network Rebuild (RNR) .
Rail Network Rebuild work involves removing track and digging out the original formation (foundation), adding stabilizing mesh, putting in and compacting new formation, then replacing the rails and sleepers and then re-ballasting. This example at Sylvia Park includes adding a new crossover, which will improve flexibility on the network.
To renew formation quickly, KiwiRail is using a range of specialist machines and technology. These include:
Without suspending frequent commuter services, it would be impossible to safely use much of this time-saving technology.