Table 1 Classification of internal defects in railway track
Sequence number | Defect types | Detection probe | Image color |
|---|---|---|---|
1 | Inside flaw of rail head | 70° probe | R |
2 | Middle flaw of rail head | 70° probe | G |
3 | Outside flaw of rail head | 70° probe | B |
4 | Upper crack on the inside of the screw hole | 37° probe | G |
5 | Inverted upper crack on the inside of the screw hole | 37° probe | G |
6 | Inverted lower crack on the inside of the screw hole | 37° probe | G |
7 | Upper crack on the outside of the screw hole | 37° probe | B |
8 | Lower crack on the outside of the screw hole | 37° probe | B |
9 | Inverted lower crack on the outside of the screw hole | 37° probe | B |
10 | Horizontal crack of screw hole | 0° probe | R |
11 | Defect of rail bottom | 37° probe | G, B |
12 | Longitudinal crack of rail bottom | 37° probe | R |