This excerpt taken from the NSC 8-K filed Jun 12, 2007.
Maintenance of Way
Continue to maintain track network to
Normalized annual rail replacement should
Tie & Surfacing should be about 16% of
2.6 million Crossties
2.9 million Tons of Ballast
As I mentioned, and as was demonstrated in Tim Drakes presentation, maintenance of our track network is the largest component of our capital plan. Our Engineering Department develops an annual maintenance budget through a process that involves rigorous analysis and the best science available. Our goal is to optimize the level of investment required to meet two major objectives: to operate trains over our track infrastructure safely and efficiently, and to meet our customers standards for speed and reliability.
On a normalized basis, rail replacement should be between 325 and 350 miles annually, although I should note that we have not yet reached normalized levels. In addition, our plan is to tie & surface about 3,000 track miles per year, surface another 2,000 track miles per year, and install about 2.5 million crossties per year.