299.311 Track geometry; general.§ 299.311 Track geometry; general.
If the values listed in the following table are exceeded, the railroad shall initiate remedial action. A reduction in operating speed so that the condition complies with the limits listed for a lower speed shall constitute bringing the track into compliance.
Table 1 to § 299.311
|Track geometry parameter (millimeter (mm))||Track class||H0||H1||H2||H3||H4||H5||H6||H7|
|Gauge is measured between the heads of the rails at right angles to the rails in a plane 14 mm (0.55 inches) below the top of the rail head and may not exceed -||Min.||1429||1429||1429||1429||1429||1429||1429||1429|
|The deviation from uniformity 1 of the mid-chord offset on either rail for a 10 meter (m) chord (alignment) may not be more than -||10 m chord||38||31||31||14||12||10||8||7|
|The deviation from uniform profile on either rail at the mid-ordinate of a 10 m chord (surface) may not be more than -||10 m chord||40||40||40||27||22||18||15||13|
|The deviation from uniform crosslevel at any point on tangent and curved track may not be more than -||50||26||26||22||18||14||9||9|
|The difference in crosslevel between any two points 2.5 meters (8.2 feet) apart (twist) may not be more than -||2.5 m||26||26||26||22||18||14||9||9|
1 Uniformity for alignment at any point along the track is established by averaging the measured mid-chord offset values for a 10 m (32.8 feet) chord for nine consecutive points that are centered around that point and spaced at 2.5 m (8.2 feet) intervals.