所以查了一下美國鐵路長度,和中國鐵路長度的曆史.
| 年份 | km | ±% p.a. |
|---|---|---|
| 1949 | 21,800 | — |
| 1955 | 25,600 | +2.71% |
| 1960 | 33,900 | +5.78% |
| 1965 | 36,400 | +1.43% |
| 1970 | 41,000 | +2.41% |
| 1975 | 46,000 | +2.33% |
| 1980 | 53,300 | +2.99% |
| 1985 | 55,000 | +0.63% |
| 1990 | 57,800 | +1.00% |
| 1995 | 62,400 | +1.54% |
| 2000 | 68,700 | +1.94% |
| 2005 | 75,400 | +1.88% |
| 2007 | 77,966 | +1.69% |
| 2008 | 79,687 | +2.21% |
| 2009 | 85,818 | +7.69% |
| 2010 | 90,504 | +5.46% |
| 2011 | 93,200 | +2.98% |
| 2012 | 97,600 | +4.72% |
| 2013 | 103,144 | +5.68% |
| 2014 | 112,000 | +8.59% |
| 2015 | 121,000 | +8.04% |
| 2016 | 124,000 | +2.48% |
| 2017 | 127,000 | +2.42% |
| 2018 | 131,000 | +3.15% |
| 2019 | 139,000 | +6.11% |
| 2020 | 146,300 | +5.25% |
| 2021 | 150,000 | +2.53% |
| 2022 | 155,000 | +3.33% |
| 2023 | 159,000 | +2.58% |
USA:
Early years
- 1845: 2,441 miles of track
- 1850: 6,621 miles of track, more than the rest of the world combined
- 1860: 10,433 miles of track, with Chicago becoming the leading rail hub
- 1865: 35,000 miles of track
Golden age
- 1880: 70,000 miles of track
- 1890: 154,000 miles of track
- 1900: 193,000 miles of track
- 1916: 254,000 miles of track, the eve of World War I
Modern years
- 2017: 93,150 miles of Class I track
- 2018: 92,837 miles of Class I track
- 2019: 92,282 miles of Class I track
- 2020: 91,773 miles of Class I track
