机械保溫车在溫度条件和保证貨物完整性方面虽然远远超越于冰箱保溫车,但在整个保溫车中所占比例仍然是不大的。如:1959年机械保溫车,在苏联仅占保溫车总数的6％;在美国,则只占4.5％(据1961年统计,美国机械保溫车有6202辆,占保溫车总数的6％)。阻碍机械保溫车迅速增长的原 Mechanical insulated car in the temperature conditions and to ensure the integrity of the goods far beyond the refrigerator insulation car, but the proportion of the entire insulation car is still not large. Such as: 1959 mechanical insulation vehicles, the Soviet Union accounted for only 6% of the total number of insulation cars; in the United States, only 4.5% (according to statistics in 1961, the United States has 6202 thermal insulation vehicles, accounting for 6% of the total number of insulation cars). Prevent the rapid growth of mechanical insulation car original