It is in use in Aarhus, Bochum, Berlin (BVG-Class IK), Basel, Geneva, Lyon, Ostrava (NF2) and Sarajevo (NF3).

The cities operating Tango are demanding the following characteristics for their rolling stock: speed (up to 100 km/h or 62 mph), robustness, security and compatibility with the common use of infrastructure, economic (capacity adapted to the traffic and prospects for their development) as well as comfort and aesthetics.

In the case of the Appenzell Railways, the light rail needs to deal also with strong gradients in the foothills south of St.

[1] In Lyon, the Tango tram is serving the express line Rhônexpress linking downtown with Saint Exupéry Airport, and its TGV train station, opened in 2010.

Previously, the western line from St. Gallen to Appenzell was operated by heavy rail with a rack section.