High Quality Content by WIKIPEDIA articles! The Y1 is a diesel-hydraulic standard gauge railcar (single self-propelling carriage). It is in use in Croatia, Norway, Serbia, Kosovo and Sweden. The production of the railcars was begun in 1980 by Kalmar Verkstad and Fiat Ferroviaria for Sweden. Y1 is based on the Italian model ALn 668. This diesel railcar was built dring the period 1954 - 1981. 787 vehicles were built in 12 series. SJ AB, the Swedish railways, needed new short diesel railcars for lines like Inlandsbanan. SJ bought this model from Fiat. They were based on an existing model, but modified for Swedish needs. The first were produced in Italy, and later in Kalmar, Sweden. 100 vehicles were made during the period 1979-1981.

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