| 1 | Rust has corroded the steel rails. | |
| 2 | Trains run on two rails . | |
| 3 | Can you tell a green field from a cold steel rail? | |
| 4 | Therefore, developing high-speed detection technology for rail profile has great significance. | |
| 5 | These results can help find the method to slower the rail side abrasion. |
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