All electric trains in the Netherlands are now powered by wind energy.
This has happened a year earlier than initially anticipated, following an agreement between Dutch national railway company Nederlandse Spoorwegen (NS) and power firm Eneco to reach this point by January 2018.
The companies will continue to work together as part of the decade-long deal they agreed upon two years ago.
NS says an increase in the number of wind farms across the country has allowed the project to reach completion a year ahead of schedule – one wind turbine running for an hour can produce enough power to send a train approximately 120 miles.
Around 600,000 passengers use the trains every day across 5,500 scheduled journeys.
The companies hope to reduce the energy used per passenger by a further 33% by 2020 compared to 2005 levels.