Australia began experimenting with railway sleepers made from recycled plastic in 2015, turning material that might otherwise have gone to landfill into a component designed to sit beneath railway tracks.
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that → begin → tracks
Developed by Integrated Recycling with researchers at Monash University's Institute of Railway Technology, the Duratrack sleeper is made from about 85% post-consumer plastic waste, including agricultural plastics, polystyrene and other difficult-to-recycle materials.
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sleeper → develop → plastics
After years of laboratory research and smaller railway trials, the sleepers reached Melbourne's metropolitan network in 2019, when about 190 were installed at Richmond station.
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190 → reach → station
Further testing followed at Tottenham Junction, where researchers monitored plastic and timber sleepers under real railway conditions.
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researchers → follow → conditions
The sleepers were eventually approved for specified low-speed applications and have a potential lifespan of up to 50 years.
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sleepers → approve → years
Australia's plastic-to-railway experiment
The Duratrack project grew from an attempt to address two problems at the same time: the need for railway sleepers and the growing volume of plastic waste requiring new uses.
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project → grow → uses
Monash University's Institute of Railway Technology worked with Victorian manufacturer Integrated Recycling to develop a composite sleeper that could replace conventional materials such as timber.
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that → work → timber
Research into the application of recycled plastic sleepers began in 2015, with government-backed research and development helping the technology move from development towards railway trials.
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technology → recycle → trials
The resulting Duratrack sleeper contains about 85% post-consumer plastic waste.
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sleeper → result → waste
The material includes agricultural plastics such as silage wrap and twine, as well as other waste streams including polystyrene.
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material → include → polystyrene
These materials were selected because they could otherwise have ended up in landfill or required other forms of disposal.
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they → select → disposal
Instead of treating the plastic as waste, the project turned it into a structural railway product.
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project → treat → product
Researchers had to prove plastic could support railway tracks
Using recycled plastic in a railway sleeper required more than demonstrating that the material could be moulded into the right shape.
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material → prove → shape
Sleepers sit beneath rails and help transfer loads into the track structure.
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Sleepers → sit → structure
They must therefore withstand repeated forces while maintaining the geometry and stability of the railway.
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They → withstand → railway
Monash researchers carried out laboratory testing of Duratrack to examine properties including its elastic modulus, maximum elastic strain limit and response to different strain rates.
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researchers → carry → rates
They also investigated load transfer, track stability, noise and vibration.
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They → investigate → transfer
Researchers developed a finite-element model using the measured properties to examine how factors such as track gauge and sleeper dimensions affected the material's behaviour.
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factors → develop → behaviour
Before the sleepers reached Melbourne's metropolitan railway network, Duratrack had also been trialled on selected tourist and heritage railways in Victoria, including Puffing Billy, Walhalla Goldfields Railway and Victorian Goldfields Railway.
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Duratrack → reach → Billy
These earlier trials provided experience with the material before it was subjected to testing on a metropolitan network.
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it → provide → network
Nearly 200 plastic sleepers went under Melbourne trains
A major step came in June 2019, when Duratrack sleepers were installed at Richmond railway station in Melbourne.
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sleepers → go → Melbourne
The first metropolitan trial involved about 190 sleepers as part of an 18-month trial.
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trial → involve → trial
The Victorian government described the installation as the first use of the recycled-plastic sleepers on Melbourne's metropolitan train network.
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government → describe → network
The sleepers were manufactured in Mildura by Integrated Recycling and contained recycled material sourced in Australia.
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sleepers → manufacture → Australia
The project was supported by Victorian government funding through Sustainability Victoria, with the research and development work led by Integrated Recycling and Monash University's Institute of Railway Technology.
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work → support → Technology
The Richmond installation was significant because it moved Duratrack beyond specialist heritage railways and into a working metropolitan railway environment.
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it → move → environment
The government said the recycled sleepers had a potential lifespan of up to 50 years, while also describing them as requiring less maintenance than traditional timber sleepers.
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sleepers → say → sleepers
The 50-year figure is a potential service-life estimate, rather than evidence that the sleepers have already operated for five decades.
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sleepers → operate → decades
The sleepers were tested alongside timber
Researchers then carried out another in-track trial to examine how the recycled sleepers behaved under railway conditions.
At Tottenham Junction in West Footscray, 25 Duratrack sleepers were installed in the Australian Rail Track Corporation network, interspersed with timber sleepers in a one-in-five arrangement.
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sleepers → test → arrangement
This allowed researchers to monitor the recycled sleepers within a track containing conventional timber sleepers.
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researchers → allow → sleepers
The research team monitored the sleepers over a 12-month period.
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team → monitor → period
Regular visual inspections were conducted, while researchers measured factors including strain, noise and vibration.
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researchers → conduct → strain
The aim was to understand how the plastic composite behaved in actual track conditions and to improve the design procedures used for the sleepers.
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composite → understand → sleepers
The results helped demonstrate that Duratrack could function as an alternative to timber sleepers for low-speed railway applications.
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Duratrack → demonstrate → applications
That distinction matters because the product was not approved as a universal replacement for every type of railway sleeper.
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product → matter → sleeper
Its approval was focused on applications where its performance had been demonstrated.
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performance → focus → applications
Plastic sleepers received approval for low-speed rail
The research eventually helped create a pathway for Duratrack to move into real railway projects.
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Duratrack → receive → projects
The sleeper was type-approved for low-speed siding and yard applications on the Metro Trains Melbourne and V/Line networks.
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sleeper → approve → networks
The research also contributed to the development of AS1085.22, an Australian Standard for alternative material sleepers, establishing a framework for railway sleepers made from materials other than conventional timber, concrete and steel.
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research → contribute → timber
Duratrack sleepers subsequently appeared at locations including Richmond Station, Wyndham Vale stabling yard and Tottenham Station.
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sleepers → appear → Station
…and 21 more, not listed.
The Aporia
