The older trams are generally one way so they are often coupled with a second one in reverse position, for capacity and turning over, or they are limited to racket type U turn lines only, so they are slowly getting replaced.

Newer lines don’t have loops and sometimes have stops on either side of the tracks (because of urbanization I guess), so older trams can’t use them as they have doors only to the right side of the vehicle.

I believe they will disappear in the next decade, kept only for occasional celebrations (like this one in Geneva

[–] [email protected] 1 points 2 weeks ago

This is not true. It depends on the city. Geneva and Lausanne are building without loops, as well as Lugano. Otherwise, Bern extension will have a loop, like Basel, Zurich, Glattalbahn. Bern ordered trams with one cab at each end to be more flexible during construction work and to replace the old RBS trams on line 6. But, they will receive Tramlinks with just one cab very soon. Limattalbahn is a specific case. It will extend to Baden and is a suburban dual voltage tram.