EuroCap-Rail (also spelled Eurocaprail^[1] or Eurocap Rail)^[2] is a proposed 397-kilometre (247 mi) high-speed rail corridor through Belgium, Luxembourg, and France to connect three cities—unofficially considered the capitals of the European Union—which host six of the seven institutions of the European Union: Brussels, Luxembourg, and Strasbourg. The project would upgrade rail lines from Brussels to Luxembourg (city) to Baudrecourt, France and utilize the LGV Est (opened in July 2016) between Baudrecourt and Strasbourg. EuroCap-Rail is a priority project among the Trans-European Transport Networks.

Construction never started, but almost 100 million were allocated to improve the existing railway line between Luxembourg and Brussels.^{[clarification needed]} That proved little use: the journey now takes almost an hour longer than in the 1980s.^{[3][dubious – discuss]}

The Belgian relance plan, part of the Next Generation EU recovery package, includes planned upgrades to the existing line 162 (Namur - Luxembourg border), such as increasing speeds to 160 km/h, protection against falling rocks and station modernisation. In 2024, Brussels - Luxembourg trains should reach their destination within 2 hours.^[4]