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be carried out. The trained operator should challenge any instruction that compromises safe
use of the equipment and is responsible for communicating the risks involved.
9.5 Cyclic Top Fault Report from Measurement Train
The CTMD is designed to measure track sections which the measuring train has identified as having
cyclic top faults. The CTMD can be used before, during and after maintenance.
The measuring train produces a fault report showing the GPS position, wavelength, number of
cycles of the cyclic top fault and the category of severity on a scale I, A, B, C, and D. The direction
of the measuring train can be identified by checking the mileage data. The GPS position gives the
start of the fault.
Figure 15 - Measure Train Fault Report Example
9.6 Tools
It is recommended to take spray paint to mark the start & end position of the cyclic top fault so that
recordings done before and after maintenance at the same location.
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