The line opened in 1872 between Switzerland and the
Austro-Hungarian Empire, during the opening period of the
Vorarlberg Railway, and was electrified in 1926. As of the 2023 timetable change, the line is served by international trains (
Railjet,
EuroCity) that run non-stop between
Feldkirch and
Buchs, and the regional train S2 of
Vorarlberg S-Bahn that stop at all intermediate stations in Austria and Liechtenstein. In June 2008, the
canton of St. Gallen, the Federal State of
Vorarlberg, and the Principality of Liechtenstein signed an agreement for a project to upgrade the line (and the surrounding ones) and to increase the rail traffic. The project, named was approved by Liechtenstein and Austria in a
letter of intent signed in April 2020 and under that plan, it was to be fully realised by 2027 and would have costed an estimated
€187 million. That plan was, however, rejected by 62.3% of Liechtenstein voters in a referendum on 30 August 2020. ==Stations==