PANDROL CD200 IQ Operation And Maintenance Manual page 105

3. Migration
Material migration results from a rolling action that forces the surface material sideways. This can occur in two
places:
3.1. Tread Rollover
This forms on the tread chamfer "Figure 153. Rollover". The maximum allowable is 5 mm. Associated with this are
circumferential cracks "Figure 152. Circumferential cracking limit associated with rollover" which do not affect the
integrity of the wheel.
3.2. Migration down the flange
Shown in "Figure 154. Migration down the flange" where the extreme edges have flaked off. This does not affect
the integrity of the wheel. These defects are removed when re-profiling becomes necessary to restore the wheel
profile
Figure 160. Circumferential cracking limit associated with
rollover
OPERATION AND MAINTENANCE MANUAL I ENG_OMM_CD200IQ_P03 I 11 February 2022
@Pandrol 2022
Figure 161. Rollover
Figure 162. Migration down the flange
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