Trans Europ Express
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. , the "Iris" was one of two EuroCity train-pairs running daily between Brussels and Switzerland; the other was the "Vauban".