为了适应我国铁路大力开展集装箱运输的需要,铁道部于1979年6月下达任务,要求北京二七车辆厂今年内完成10辆NJ4a型集装箱专用平车设计、试制任务,在全厂职工的共同努力和四方车辆研究所的大力协助下,于今年六月底试制完成,填补了我国铁路车辆的空白。经过试装和初步鉴定,即将投入运用考验。 In order to meet the needs of China’s railways vigorously carrying out container transport, the Ministry of Railways issued a mandate in June 1979, requiring Beijing No.2 Vehicle Factory to complete the design and trial of 10 NJ4a container-type special flat trucks by this year and work together in the whole plant. And the vigorous assistance of the Sifang Vehicle Research Institute, the trial production was completed by the end of June this year, filling the gap of China’s railway vehicles. After the trial equipment and preliminary identification, will soon put into use test.