一、美、加铁路现状美国铁路营业里程最长时曾达40.8×10km(1916年),目前约26万余公里,居世界首位。一级铁路约占99%,由30家私营铁路公司经营,其中2/3的铁路,仅由14家大铁路公司掌握。加拿大铁路营业里程最长时(五十年代)曾达7万余公里;目前约6.5万余公里。主要由三家铁路公司(其中一家为国营公司)经营。 I. Status of the United States and Canada plus Railways At the longest, the U.S. railroad mileage has reached 40.8 × 10km (1916), currently about 260,000 kilometers, ranking first in the world. About 99% of Grade I railways are run by 30 private railways, of which two thirds are controlled by only 14 major railways. Canada’s longest railway mileage (fifties) has reached more than 70,000 kilometers; currently about 65,000 kilometers. Mainly run by three railway companies, one of them a state-owned company.