The railways of Europe had originated during the nineteenth century as many separate concerns across numerous nations; this led to disparate and conflicting standards emerging and thus onto incompatibility. One prominent example was the
British Gauge War, during which different
railway companies were laying different
track gauges across
Great Britain, causing inefficiency wherever a
break of gauge occurred, prior to an
Act of Parliament the issue in 1846 by establishing one
standard gauge of . The early effort towards standardisation somewhat influenced railways abroad as well, however various other track gauges persisted and developed across the world; even through to the twenty first century, incompatible track gauges, let alone other issues, persisted to hinder interoperability efforts. Several key events happened during the early twentieth century; in the aftermath of the
First World War and the
Treaty of Versailles, numerous border changes were enacted across Europe, which greatly impacted several formerly united national railway networks while compelling several others together in some cases. It was early into the
interwar period that the UIC was established on 17 October 1922 with the principal aim of standardising practices across the railway industry and expanding international cooperation in the sector. The UIC has introduced numerous classification systems over the decades. During the 1970s, the
UIC Franc currency equivalent was established for the purpose of easing international ticket revenue sharing; it was replaced by the
European Currency Unit on 1 January 1990.
UIC classification and
UIC Country Codes allowed precise determination of rolling stock capabilities and ownership; furthermore, wagons have been assigned their own unique
UIC wagon numbers. Over time, the UIC has formed various partnerships and cooperative frameworks with other multinational railway authorities, such as the
European Union Agency for Railways. The UIC has played a leading role in the development of
Technical Specifications for Interoperability (TSIs), which have gradually taken over from older standards developed by various national railway entities. During the 1990s, the
GSM-R radio telecommunication system was formulated as an international
interoperability specification covering voice and signalling systems for railway communications. GSM-R, which is built on
GSM technology, was designed to be a cost efficient digital replacement for various existing incompatible in-track cable and analogue railway radio networks. The specification for GSM-R is maintained via the UIC project
European Rail Traffic Management System (ERTMS). By June 2023, GSM-R had been implemented across roughly 130,000km of track, along with 90,000 cab radios and 20,000
datalink radio units. A more capable next-generation radio, the
Future Railway Mobile Communication System (FRMCS) program, is under development as of 2023. == Mission ==