This will be one of the last times the old GT8-100C/2S TramTrains are used. They can be driven from both ends, and such are used for shuttle services like this, where normal turning loops are not available. Starting next year, the remaining C/2S services will instead be served by the new class 492 TramTrains.
Well, on true one-sided trams you also save the equipment for an entire driver’s stand. Although that (mostly) doesn’t apply here.