Eurostar in the context of London St Pancras railway station

Inter-city rail services are express trains that run services that connect cities over longer distances than commuter or regional trains. They include rail services that are neither short-distance commuter rail trains within one city area nor slow regional rail trains stopping at all stations and covering local journeys only. An inter-city train is typically an express train with limited stops and comfortable carriages to serve long-distance travel.

Inter-city rail sometimes provides international services. This is most prevalent in Europe because of the proximity of its 50 countries to a 10,180,000-square-kilometre (3,930,000-square-mile) area. Eurostar and EuroCity are examples. In many European countries, the word InterCity or Inter-City is an official brand name for a network of regular-interval and relatively long-distance train services that meet certain criteria of speed and comfort. That use of the term appeared in the United Kingdom in the 1960s and has been widely imitated.

King's Cross railway station, also known as London King's Cross, is a passenger railway terminus in the London Borough of Camden, on the edge of Central London. It is in the London station group, one of the busiest stations in the United Kingdom and the southern terminus of the East Coast Main Line to Yorkshire and the Humber, North East England and Scotland. Adjacent to King's Cross station is St Pancras International, the London terminus for Eurostar services to continental Europe. Beneath both main line stations is King's Cross St Pancras tube station on the London Underground; combined, they form one of the country's largest and busiest transport hubs.

The station was opened in King's Cross in 1852 by the Great Northern Railway on the northern edge of Central London to accommodate the East Coast Main Line. It quickly grew to cater to suburban lines and was expanded several times in the 19th century. As part of the Big Four grouping in 1923, it came under the ownership of the London and North Eastern Railway, who introduced famous services such as the Flying Scotsman and locomotives such as Mallard. The station complex was redeveloped in the 1970s, simplifying the layout and providing electric suburban services, and it became a major terminus for the high-speed InterCity 125. As of 2018, long-distance trains from King's Cross are run by London North Eastern Railway to Edinburgh Waverley, Leeds and Newcastle; other long-distance operators include Hull Trains and Grand Central. In addition, Great Northern runs suburban commuter trains around North London, Hertfordshire, Cambridgeshire and Norfolk.

King's Cross is a district in the London boroughs of Camden and Islington, on either side of Euston Road in north London, England, 1.5 miles (2.4 km) north of Charing Cross, bordered by Barnsbury to the north, Clerkenwell to the southeast, Angel to the east, Holborn and Bloomsbury to the south, Euston to the west and Camden Town to the northwest. It is served by two major rail termini, St Pancras and King's Cross. King's Cross station is the terminus of one of the major rail routes between London and the North.

The area, which was historically the south-eastern part of the parish and borough of St Pancras, and once known for drug-dealing and prostitution, has undergone significant regeneration since the mid-1990s. The introduction of the Eurostar rail service at St Pancras International and the rebuilding of King's Cross station helped stimulate the redevelopment of the long-derelict railway lands to the north of the termini.

Eurostar Group is the parent holding company of the Eurostar high-speed rail service. It wholly owns Eurostar International Limited (EIL), which operates Eurostar services via the Channel Tunnel, and THI Factory (THIF), which operates Eurostar services within continental Europe. Eurostar Group is majority-owned by SNCF Voyageurs and is based in Brussels, Belgium.

Intercity Express (commonly known as ICE (German pronunciation: [iːtseːˈʔeː] ) and running under this category) is a high-speed rail system and service in Germany. It also serves destinations in Austria, France, Belgium, Switzerland and the Netherlands as part of cross-border services. It is the flagship of the German state railway, Deutsche Bahn. ICE fares are fixed for station-to-station connections, on the grounds that the trains have a higher level of comfort. Travelling at speeds up to 300 km/h (190 mph) within Germany and 320 km/h (200 mph) when in France, they are aimed at business travellers and long-distance commuters and marketed by Deutsche Bahn as an alternative to flights.

The ICE 3 also has been the development base for the Siemens Velaro family of trainsets which has subsequently been exported to Renfe in Spain (Renfe Class 103), which are certified to run at speeds up to 350 km/h (220 mph), as well as versions ordered by China for the Beijing–Tianjin intercity railway link (CRH 3) and by Russia for the Moscow–Saint Petersburg and Moscow–Nizhny Novgorod routes (Velaro RUS) with further customers being Eurostar as well as Turkey and Egypt.

Stratford International is a National Rail station in Stratford and a separate Docklands Light Railway (DLR) station nearby, located in East Village in London. Despite its name, no international services stop at the station; plans for it to be served by Eurostar trains never came to fruition. However, there are plans to use it as a terminus for Eurostar competitor Gemini Trains from 2029 (see International services). The National Rail platforms are served by Southeastern trains on the High Speed 1 route originating at London St Pancras International (which is served by Eurostar). On the DLR, it is a terminus – one of seven end-of-the-line termini – for local services via Canning Town and London City Airport.

Construction of the National Rail station was completed in 2006, but it only opened in 2009 to serve Southeastern services on HS1. In 2011, an extension of the DLR was opened to connect Stratford International to the wider London public transport network, and to the main Stratford station to the south. The DLR station is physically separate and located just across the road from the HS1 station. Oyster cards and contactless payment cards are valid for travel to and from Stratford International, with the DLR station in London fare zone 2 and 3, but special fares apply at the HS1 station.