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1. Two men stumbled along ahead of the wheels treading out a safe path across the seething grass.

2. The principle of the project is that the wheel tread will generate the impact load that induce deformation of rail when the train running.

3. The causes to wheel tread flat are analyzed from such aspects as structure of 120 valve, functional performance, inspection and repair. Counter measures are given.

4. Compared to the new wheel tread, the worn tread is easy to form two-point contact nearby the depression area of the nominal diameter position of wheel tread.

5. And the effect of wheel tread peeling on peeling of bearings is expounded.

6. A new approach for surface parameter measuring of wheel tread with linear structured laser scanning is put forward.

7. Analysing the alignment evolvement of the locomotive wheel tread and the character of wearing tread, giving the uniformity wear suppose of the wheel tyre tread.

8. The latest developed inspection device for wheel tread flat in Japan is described.

9. Peeling is the main type of failure of wheel tread.

10. A virtual file for smoothing digital profile of wheel tread of railway vehicles is created based on MATLAB and specific roughness calculation method.

11. Wheel tread wear leads to change of the wheel profile and rolling diameter,[Sentence dictionary] which influences the dynamic behaviors of railway vehicles seriously.

12. Under the investigation to the fault of wheel tread flat sliding of freight car, in this paper, the fault reason was found and corresponding improving measures and proposes were put forward.

13. The paper describes the testing system for researching measurement of the railroad car wheel tread by means of CCD-video camera.

14. The principle of a measurement system used to inspect the wheel tread contour of locomotives and cars with linear CCD image sensor is introduced.

15. Because many rail transit vehicles are in the operation, some of them already in the overhaul time, so defects on the wheel tread are found frequently.

16. The wheel-rail contact geometry relationship is different when different wheel tread shape matches the same rail, which will influence the dynamic performance of the vehicle.

17. In combination with precision motion control and laser scanning along axle and circular direction, the method can classify and recognize the defects of scotching and flaking on wheel tread.

18. Through studying a large number of existing domestic and abrasion test methods, and analyzes their advantages and disadvantages, this paper advanced a new method of detecting the wheel tread.

19. The interaction between wheel and rail results in the severe damage of the wheel tread, which is a problem that has not been resolved yet.

20. The supercooled austenite transforms into friable martensite layer during the following rapid cooling process, leading to cracking and spalling at wheel tread.

21. Wheel tread wear is one of the main causes that threaten safety of trains, a kind of method is put forward, which is the subtraction of pattern recognition applying in the wheel tread wear of trains.

22. The principles, structure and application effect of the non contact type automatic inspection equipment for wheel tread shape are described.