Class of track | Tangent track | Curved track | |
The deviation of the mid-offset from a 62-foot line1 may not be more than-(inches) | The deviation of the mid-ordinate from a 31-foot chord2 may not be more than-(inches) | The deviation of the mid-ordinate from a 62-foot chord2 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 the 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
Class of track | Curved track | |
The deviation of the mid-ordinate from a 31-foot chord1 may not be more than-(inches) | The deviation of the mid-ordinate from a 62-foot chord1 may not be more than-(inches) | |
Class 1 track2 | 3 N/A | 11/4 |
Class 2 track2 | 3 N/A | 11/4 |
Class 3 track | 3/4 | 11/4 |
Class 4 track | 3/4 | 7/8 |
Class 5 track | 1/2 | 5/8 |
1 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.
2 Restraining rails or other systems may be required for derailment prevention.
3 N/A-Not Applicable
49 C.F.R. §213.55