Title 49: Transportation
PART 213—TRACK SAFETY STANDARDS
Subpart G—Train Operations at Track Classes 6 and Higher
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§ 213.327 Alinement.
(a) Uniformity at any point along the track is established by averaging the measured mid-chord offset values for nine consecutive points centered around that point and which are spaced according to the following table:
------------------------------------------------------------------------ Chord length Spacing------------------------------------------------------------------------31[foot]................................... 7[foot]9[inch]62[foot]................................... 15[foot]6[inch]124[foot].................................. 31[foot]0[inch]------------------------------------------------------------------------
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(b) For a single deviation, alinement may not deviate from uniformity more than the amount prescribed in the following table:
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---------------------------------------------------------------------------------------------------------------- The deviation The deviation The deviation from from from uniformity of uniformity of uniformity of the mid-chord the mid-chord the mid-chord Class of track offset for a offset for a offset for a 31-foot chord 62-foot chord 124-foot chord may not be may not be may not be more than_ more than_ more than_ (inches) (inches) (inches)----------------------------------------------------------------------------------------------------------------6............................................................... \1/2\ \3/4\ 1\1/2\7............................................................... \1/2\ \1/2\ 1\1/4\8............................................................... \1/2\ \1/2\ \3/4\9............................................................... \1/2\ \1/2\ \3/4\----------------------------------------------------------------------------------------------------------------
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(c) For three or more non-overlapping deviations from uniformity in track alinement occurring within a distance equal to five times the specified chord length, each of which exceeds the limits in the following table, each owner of the track to which this subpart applies shall maintain the alinement of the track within the limits prescribed for each deviation:
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---------------------------------------------------------------------------------------------------------------- The deviation The deviation The deviation from from from uniformity of uniformity of uniformity of the mid-chord the mid-chord the mid-chord Class of track offset for a offset for a offset for a 31-foot chord 62-foot chord 124-foot chord may not be may not be may not be more than_ more than_ more than_ (inches) (inches) (inches)----------------------------------------------------------------------------------------------------------------6............................................................... \3/8\ \1/2\ 17............................................................... \3/8\ \3/8\ \7/8\8............................................................... \3/8\ \3/8\ \1/2\9............................................................... \3/8\ \3/8\ \1/2\----------------------------------------------------------------------------------------------------------------
