X20 X21 X22 and X23 is a series of two to four car electric multiple units operated by Trafikaktiebolaget Grängesberg-Oxelösunds Järnvägar (TGOJ) of Sweden. Thirteen units were built by Hilding Carlsson Mekaniska Verkstad in 1956-59. They have since been sold to Tågkompaniet and are still in service. The SJ X9 EMUs were partly derived from this type.
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