TABLE 2-8 Automated Track Inspection Program (ATIP) Exceptions(1) per 100 Miles: 2004-2011
| 2004 | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 | Average | |
|---|---|---|---|---|---|---|---|---|---|
| Profile | 4.2 | 3.4 | 3.5 | 3.2 | 2.4 | 1.9 | 2.1 | 2.4 | 2.6 |
| Alignment | 2.7 | 1.6 | 1.3 | 1.7 | 1.4 | 1.8 | 2.0 | 2.0 | 1.8 |
| Gage | 13.6 | 8.5 | 6.6 | 5.1 | 12.2 | 7.2 | 3.1 | 2.1 | 6.4 |
| Cross-level | 8.7 | 5.2 | 5.6 | 2.0 | 2.0 | 2.2 | 1.2 | 1.3 | 2.7 |
| Warp | 8.1 | 11.2 | 6.7 | 4.7 | 3.7 | 4.0 | 2.8 | 1.8 | 4.4 |
| Runoff | 0.1 | 0.8 | 0.7 | 0.4 | 0.6 | 0.7 | 0.6 | 0.8 | 0.6 |
| Twist | 0.6 | 5.5 | 1.9 | 1.8 | 1.7 | 1.5 | 1.3 | 1.0 | 1.6 |
| Limited Speed | 6.8 | 6.3 | 5.9 | 9.9 | 9.7 | 8.7 | 11.8 | 3.1 | 8.2 |
| Total per 100 Miles | 38.0 | 36.1 | 26.3 | 28.7 | 33.7 | 27.9 | 24.8 | 14.5 | 27.1 |
| Miles Inspected | 34,699 | 29,051 | 26,886 | 59,165 | 52,997 | 74,715 | 83,013 | 74,541 |
1 Exceptions mean track did not meet normal operation standards
KEY: ATIP = Automated Track Inspection Program
NOTES: In 2007 three new inspection cars came online. Defects are briefly defined as variations from design values for the following track geometry properties:
Profile - rail surface elevations
Alignment - track direction (tangent or curvature)
Gage - distance between rails
Cross-level - elevation difference between the rails
Warp - maximum change in cross-level over a specified distance
Runoff - elevation (ramp) difference of a line along the top of the rail is used for the projection
Twist - rate of introduction and removal of cross-level on transitions from straight to curved track alignment
Limited Speed - reduced operating speed due to track geometry constraints
Detailed definitions and standards may be found in U.S. Department of Transportation, Federal Railroad Administration, Track and Rail and Infrastructure Integrity Compliance Manual, July 2012.
SOURCE: U.S. Department of Transportation, Federal Railroad Administration, Office of Safety, ATIP Statistics (December 31, 2011). Available at http://www.fra.dot.gov/ as of February 2014.