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I think this is actually a train and a half: if a terminus didn't have the track layout necessary for the motor car to run around the trailer, quite a few places in Germany had a system where the trailer was taken over by the motor car of the previous train (which in turn had given up its trailer to the motor car before it, etc.). Trains with motor cars at either end and trailers in between were virtually or actually non-existant because cars could not be centrally controlled.
You're very probably right - it looks as if the third tram isn't yet coupled to the trailer. Shades of Woltersdorf
Oh, but isn't the Woltersdorf thing that the trailer only runs part of the way before returning behind a different motor car? That used to be quite common as well, though, in some cases with bi-directional trailers pulled by uni-directional motor cars (there were loops at each end, but the trailer had to be reversed when it headed back along the way).
Yes, Woltersdorf is a little different in that respect - a combination of lack of passengers to the canal terminus and lack of courage on the hill going down there!