$7 million per mile ($4.3 million/km; equivalent to $23.7 million per mile [$15 million/km] in 2023 [1])
(equivalent to $225 million in 2023 [1]) [2]
1 and 2 metres (3.3 and 6.6 ft)
1 foot 1 inch (0.33 m)
a mile (1.6 km)
130,000 metric tons (140,000 short tons; 130,000 long tons)
1.8 million metric tons (2 million short tons; 1.8 million long tons)