The RABe 501, nicknamed Giruno, is a high-speed electric multiple unit train built by Stadler Rail of Switzerland for the Swiss Federal Railways (SBB).

This was changed in 2017 to SMILE,[8] short for Schneller Mehrsystemfähiger Innovativer Leichter Expresszug (English: “speedy multi-system innovative lightweight express train”).

[8][9] The SBB have named the train Giruno (from Girun, Romansh for "buzzard", "bearded vulture" or "kestrel").

In April 2012, Swiss Federal Railways (SBB) issued a tender for 29 new single-deck trains, capable of reaching 250 km/h (155 mph), for service on routes between Germany, Switzerland and Italy via the then under-construction Gotthard Base Tunnel,[12] the only completely flat route through the great Alpine barrier.

Bids were placed by Stadler Rail (Switzerland), Siemens (Germany), Alstom (France) and Talgo (Spain).

[8] As SBB intend to operate these trains across several countries, testing had to be carried out in Germany, Italy and Austria, in addition to Switzerland.

[19] In February 2024, Stadler and Saudi Arabia Railways (SAR) signed a contract for the supply and maintenance of 10 DMU trains, with an option for 10 more, depicted on artist impressions using the same cab as the Giruno.

[23] As a long-distance train, it also features signal boosters for 3G/4G cellular phone networks, power sockets (for Swiss and international plugs) and large luggage racks for passenger comfort, along with energy-efficient lighting.