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 Max. 1454 1454 1454 1454 1454 1454 1454 1454 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.