Esch-sur-Alzette to Brussels train with Regional-Express

Regional-Express (RE, or REX in Austria) is a type of regional train service found in Germany, Luxembourg, and Austria. It functions as a semi-fast train, making fewer stops than a Regionalbahn or S-Bahn but more than an Intercity or Intercity Express. RE services typically reach top speeds of 160 km/h, with some reaching 200 km/h on high-speed lines. While initially operated by DB Regio, many lines are now run by various private operators. These trains often use double-deck cars with electric or diesel locomotives.

Regionalbahn (RB) is a type of local passenger train service in Germany, similar to regional train categories in Austria and Switzerland. These trains typically stop at all stations along a given line, connecting cities to their surrounding areas and serving shorter, regional routes. While many RB trains are operated by DB Regio, a subsidiary of Deutsche Bahn, other private companies also run these services. Regionalbahn trains are a budget-friendly option for regional travel and are often covered by tickets like the Deutschland Ticket.