AdBlue for railway trains

AdBlue® for railway trains

AdBlue® allows the reduction of nitrogen oxides emissions (NOx) in diesel locomotives that are equipped with SCR systems. Several engine manufacturers; such as Siemens, Alstom and Bombardier, have chosen this technology for their new models. Some train operators in Europe have responded early to local or national legislation on NOx limits for trains and are already using AdBlue.

Our expertise as a partner that already provides AdBlue to SCR diesel locomotives

Our dedicated brand of AdBlue, Air1, that has been produced since 2004 and supplying locomotives in the rail sector since 2010.

  • We are the leading AdBlue producer in the world. We supply the global markets with AdBlue from our plants in Europe, including our Sluiskil plant in the Netherlands; which is the world’s largest AdBlue production site in the world. Yara has been a leading player in the market since 1993 and worked with OEMs to define what AdBlue would be.

To ensure good performance in your SCR locomotive, make sure you use only AdBlue that comes from a reliable source and uncontaminated urea, such as Yara’s brand, Air1.

  • Yara also has its own logistics network dedicated to AdBlue, to ensure the quality and compliance of AdBlue which we market under the Air1 brand. Our factories and our supply chain are subject to regular audits to monitor the quality of AdBlue that we sell.
  • Our commercial teams will share their experience and knowledge of AdBlue with railway networks operator, to guide them in the use of AdBlue.

AdBlue is an easy to use and non-hazardous product, that is stored in a dedicated tank, separate from that of the diesel. Simply fill the tank with AdBlue, when you top up with diesel. When the locomotive is running, AdBlue is injected into the exhaust pipe that links the engine to the SCR catalyst. Heated by the exhaust fumes, AdBlue turns into ammonia and carbon dioxide through a chemical reaction.

When the exhaust fumes that contain nitrogen oxides, ammonia and CO2 react with the catalyst, the NOx molecules are transformed into water and nitrogen. Instead of emitting harmful nitrogen oxide, the diesel locomotive emits nitrogen and water vapour and therefore considerably reduces its pollution.

There are currently only a few diesel locomotives in the world that are equipped with SCR systems, which need AdBlue. At European level, there are on-going discussions on applying limits to NOx emissions of trains. This is linked to the revision of the NRMM Directive on non-road vehicles.

Some European countries, such as Sweden, have national legislation that limit the NOx emissions. This country is particularly advanced in this area. Its rail network must ensure that any new diesel locomotive is equipped with SCR system for the control of NOx.