The Stadler Citylink (known as the Vossloh Citylink until 2015) is a series of tram-trains manufactured by Stadler Rail at its Valencia factory since 2003. They are currently used in Spain, Germany and the United Kingdom, with the Class 399 variant in service on the Sheffield Supertram network in the United Kingdom from September 2017 as the country's first tram-train. The second tram-train to be introduced in the UK will be introduced on the South Wales Metro in 2022.