The RegioExpress is a fast regional train

Train

A train is a connected series of vehicles for rail transport that move along a track to transport cargo or passengers from one place to another place. The track usually consists of two rails, but might also be a monorail or maglev guideway.Propulsion for the train is provided by a separate...

 in Switzerland

Switzerland

Switzerland name of one of the Swiss cantons. ; ; ; or ), in its full name the Swiss Confederation , is a federal republic consisting of 26 cantons, with Bern as the seat of the federal authorities. The country is situated in Western Europe,Or Central Europe depending on the definition....

, run by the Swiss Federal Railways

SBB-CFF-FFS

Swiss Federal Railways and SFR are not in official use) is the national railway company of Switzerland headquartered in Bern. Formerly a government institution, it is since 1999 a special stock corporation with all shares held by the Swiss Confederation or the Swiss cantons...

 or by other private railways (such as BLS, or RhB).

Its speed is considerably faster than regional trains at the same level, as it does not stop at all stations served by the regional trains. Nonetheless, it is slightly slower than InterRegio

InterRegio

The InterRegio is a train service seen in some European countries. Mostly they are trains that run "from region to region", as best described by Swiss Federal Railways.-Switzerland:...

 trains. Swiss Federal Railways describes the trains as ones that serve "rapidly into the regions".

Until the 2003 timetable overhaul(December 2002 to December 2003), the RegioExpress was limited in circulation. One of the main lines which ran as a RegioExpress line (abbreviation: RX) was the Rheintal Express, from St. Gallen

St. Gallen

St. Gallen is the capital of the canton of St. Gallen in Switzerland. It evolved from the hermitage of Saint Gall, founded in the 7th century. Today, it is a large urban agglomeration and represents the center of eastern Switzerland. The town mainly relies on the service sector for its economic...

 through Sargans

Sargans

Sargans is a municipality in the Wahlkreis of Sarganserland in the canton of St. Gallen in Switzerland.Sargans is known for its castle, which dates from before the founding of the Swiss Confederation in 1291...

 to Chur

Chur

Chur or Coire is the capital of the Swiss canton of Graubünden and lies in the northern part of the canton.-History:The name "chur" derives perhaps from the Celtic kora or koria, meaning "tribe", or from the Latin curia....

 (the other was the CityVogel from Zurich

Zürich

Zurich is the largest city in Switzerland and the capital of the canton of Zurich. It is located in central Switzerland at the northwestern tip of Lake Zurich...

 to Konstanz

Konstanz

Konstanz is a university city with approximately 80,000 inhabitants located at the western end of Lake Constance in the south-west corner of Germany, bordering Switzerland. The city houses the University of Konstanz.-Location:...

). As of the 2004 timetable overhaul, the RegioExpress was introduced as faster Regio (formerly regional) trains, and the term was thrown into expanded usage. The abbreviation was changed to RE instead of the previous RX in the 2005 timetable.