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.
They’re unfortunately not accessible, and not fire-safe enough to run in the underground tram tunnel, and so have largely been restricted to S31 and S32, or during construction, as is occurring here.
Thanks for the history and detail. My City in the US had some great articulated buses, but also weren’t designed with accessibility in mind and so were retired. Hopefully the replacements meet the new service standards while also contributing a positive aesthetic to the system.