CFR

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213.55—Alinement.

Alinement may not deviate from uniformity more than the amount prescribed in the following table:

Class of track	Tangent track	Curved track
Class of track	The deviation of the mid-offset from a 62-foot line 1 may not be more than—(inches)	The deviation of the mid-ordinate from a 31-foot chord 2 may not be more than—(inches)	The deviation of the mid-ordinate from a 62-foot chord 2 may not be more than—(inches)
Class 1 track	5	3 N/A	5
Class 2 track	3	3 N/A	3
Class 3 track	13/4	11/4	13/4
Class 4 track	11/2	1	11/2
Class 5 track	3/4	1/2	5/8
1 The ends of the line shall be at points on the gage side of the line rail, five-eighths of an inch below the top of the railhead. Either rail may be used as the line rail, however, the same rail shall be used for the full length of that tangential segment of track.
2 The ends of the chord shall be at points on the gage side of the outer rail, five-eighths of an inch below the top of the railhead.
3 N/A—Not Applicable.

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