as there is only one tram , and as the carriage management unit does not have maintenance facilities along the business line , the tram is sometimes sent to parent company jr west ' s rail yard for maintenance and inspection during the winter off-season . 車両関係は営業線内に保守設備を持たず予備のない1編成のみのため、冬期運休期間内に親会社のJR西日本の車両基地へ保守や検査に出されることもある。