Of the original U-series of locomotives, U-37 is still preserved. After withdrawing from the Porečanka it was sold to the Austrian railway between Weiz, Birkfeld and Ratten, during World War I it was moved to a Bosnian logging railway and later it was operating at the brickworks in Busovača. After its "retirement" it was exhibited in front of the new railway station in Koper (built in 1967 for the new standard gauge line from Divača) together with a few Bosnian cars, that were never used at the Porečanka. Another preserved U-series locomotive, U-40, is still in operation at Austrian Murtalbahn.