Zaventem to Sint-Truiden train with PKP Intercity

Intercity is a broad classification for express train services that connect cities over longer distances than commuter or regional trains, often with limited stops and comfortable carriages for long-distance travel. The term "InterCity" originated with British Rail in 1966 for its electrified West Coast Main Line services.Today, "Intercity" or "IC" is a brand name used by various railway operators across Europe and other parts of the world, including PKP Intercity in Poland, Trenitalia in Italy, and services in countries like Sweden and Ukraine. These trains typically offer both Standard and First Class seating, with amenities such as power sockets and luggage space. While some Intercity services are modern and high-speed, others may use older rolling stock, with speeds generally up to 160 km/h (100 mph).

The term "Regional" can refer to different train companies and services depending on the country. In Germany, "Regionalbahn" (RB) is a type of local passenger train that typically stops at all stations on a given line, connecting cities to their surrounding areas. Many RB trains are operated by DB Regio, a division of Deutsche Bahn, but other companies also run these services.

SNCB is Belgium’s national railway company and the country’s main train operator, offering First Class and Second Class tickets. It runs a variety of services, including Intercity trains for the fastest domestic connections, Interregio trains with more local stops, and international options such as EuroCity, Thalys, and ICE International. Thalys trains connect Belgium with France, Germany, and the Netherlands at high speed, while EuroCity and ICE International link Belgium to Germany and other European destinations. Onboard facilities typically include comfortable seating, free Wi-Fi, and power outlets. Popular routes include Brussels to Antwerp, Brussels to Bruges, Brussels to Ghent, and Brussels to Liège.