Introduced in 1974,[1] the train was operated by the National Railway Company of Belgium (NMBS/SNCB), the Chemins de Fer Luxembourgeois (CFL), the French National Railway Corporation (SNCF) and the Swiss Federal Railways (SBB-CFF-FFS).

Initially, the Iris was a first-class-only Trans Europ Express (TEE).

In 1981, it became a two-class InterCity (IC), and on 31 May 1987, it was included in the then-new EuroCity (EC) network.

[2] As of 2015[update], the Iris was one of two EuroCity train-pairs running daily between Brussels and Switzerland; the other was the Vauban.

Media related to Iris at Wikimedia Commons