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.
| 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
|