Track geometry; performance based.

  1. Law
  2. CFR 49
  3. Transportation
  4. Other Regulations Relating to Transportation
  5. Federal Railroad Administration, Department of Transportation
  6. Texas Central Railroad High-Speed Rail Safety Standards
  7. Track Safety Standards
  8. Track geometry; performance based.

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§ 299.313 Track geometry; performance based.

(a) For all track of Class H4 and above, vibration in the lateral and vertical directions measured on the carbody of a vehicle representative of the service fleet traveling at a speed no less than 10 km/h (6.2 mph) below the maximum speed permitted for the class of track, shall not exceed the limits prescribed in the following table:

Expand Table

Table 1 to Paragraph (a)

Carbody acceleration limits 1 2
Lateral vibration3 Vertical vibration3
≤ 0.35 g peak-to-peak ≤ 0.45g peak-to-peak
1 sec window 1 sec window
excluding peaks < 50 msec excluding peaks < 50 msec

1 Carbody accelerations in the vertical and lateral directions shall be measured by accelerometers oriented and located in accordance with § 299.337(c)(3).

2 Acceleration measurements shall be processed through an LPF with a minimum cut-off frequency of 10 Hz. The sample rate for acceleration data shall be at least 200 samples per second.

3 Peak-to-peak accelerations shall be measured as the algebraic difference between the two extreme values of measured acceleration in any 1-second time period, excluding any peak lasting less than 50 milliseconds.

(b) If the carbody acceleration requirements are not met on a segment of track, the segment of track is to be reclassified to the next lower Class of track for which it does meet the requirements of this part.


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