论文部分内容阅读
美国铁路面临的首要任务是提高货车的利用率,之所以有此必要是因为对货车的投资大,用于更新和现代化的费用日益增多。 1966～1975年美国铁路运用货车数的变化如表1。从表中可以看出,1966～1973年运用货车总数不断减少,原因是增加了大吨位专用货车,报废了大量旧车。1974年运用货车数开始增加,1 975年回升到1,723,605辆。 1974～1975年美国铁路增添了141,000辆新型现代化货车,平均
The primary task facing the U.S. railways is to increase the utilization rate of trucks. The reason for this is that investment in trucks is large and the expenses for updating and modernization are on the rise. The changes in the number of trucks used by the U.S. railways from 1966 to 1975 are shown in Table 1. As can be seen from the table, the total number of trucks used in the period 1966-1973 has been declining due to the increase of large-tonnage specialized trucks and the scrapping of a large number of used cars. The number of trucks used began to increase in 1974 and rose to 1,723,605 in 1997. The U.S. railways added 141,000 new modern trucks between 1974 and 1975, on average