Raileurope.co.uk (formerly Loco2) is an online booking service for train travel in the United Kingdom and Europe. It sells tickets through its website and via its smartphone app which is available on iOS and Android platforms. It was founded in 2006 by brother and sister Jamie and Kate Andrews, and started trading in 2012 from its headquarters in London. Loco2 website and apps were rebranded Rail Europe in November 2019. Functionality Raileurope.co.uk provides coverage for approximately 25 countries in Europe and is integrated with multiple rail operators, including the Rail Delivery Group in the United Kingdom, SNCF in France, Eurostar, Deutsche Bahn in Germany, SNCB in Belgium, Renfe in Spain and both Italo and Trenitalia in Italy. The company sells fares for all major high-speed rail services in Europe, such as TGV, ICE, Eurostar, AVE, Thalys, Frecciarossa, and Italo. The company's original name is both an abbreviation of the phrase "low CO2" as well as a reference to locomotive travel. Rail Europe focuses on rail travel in the UK and mainland Europe, as well as some international bus journeys. Raileurope.co.uk continued to have a carbon count facility built into its journey booking process, promoting rail travel's ability to reduce a traveller's carbon footprint by up 90%. Rail Europe acts as an alternative to traditional rail booking systems by aggregating multiple reservation systems into its service, allowing users to search for and book fares across multiple countries within one transaction. Rail Europe users can access standard rate fares as well as the discounted fares associated with each operator, such as such as Renfe's Turista Promo, Deutsche Bahn's London Sparpreis and Europa Sparpreis, as well as SNCF's Prems fares and the Rail Delivery Group's range of discounted Advance Fares. History Loco2 was founded in 2006 by Kate Andrews during her final year as an undergraduate at Sussex University. The goal initially was to launch a low-carbon travel company, specialising in grounded travel. As the company’s focus moved to European rail specifically, she was joined by her brother Jamie Andrews and Technical Director Jon Leighton, a leading contributor to Ruby on Rails. From 2011 onwards, Loco2 began to integrate with the booking systems of Europe’s major rail operators (and, since 2018, buses too). The company integrated with the following booking systems in Europe: In 2013, the company partnered with The Guardian to launch "Guardian Trains," a Guardian-branded version of Loco2's train ticket booking