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STEP 4. Calculate Measurement Distance & Position CTMD on Track
Figure 18 - Calculate Distance to Measure Diagram
- Move the trolley backwards to -20m from the start of the Cyclic Top fault. (Double check that the
CTMD has the fixed side (marked L) on the left rail)
- The length of the fault is found on the measuring train fault report. The cyclic top fault has a start
and end position shown in miles and yards. Subtract the start yards from the ending yards and
multiply the difference by 0.91 to give the length of the fault in metres.
For example, for the below mileage:
074.0556 (25)
074.0489 (22)
The length of the fault in yards is 556-489=67 yards and thus in meters 60.97 m.
The end of the measurement is at the length of the fault + 20 m thus in this example is 80.97 m.
STEP 5. Record a Cyclic Top Fault
- Press
'Start new
recording'.
- Input the
Operator
name.
- Input the
Filename.
- Click
'Start
recording' and leave the trolley in a static position. (The software will guide the user on
the necessary waiting time)
20
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