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DATA ANALYSIS

The first stage in tram track maintenance studies is gaining insights into the available dataset and understanding how different factors might impact degradation of tram tracks (i.e. gauge widening). In this section, impact of different factors on tram track degradation is analysed.

Track Deterioration Profile Over Time

For unrepaired inspection points, track deterioration over time is worked out based on the available dataset. This is carried out with respect to the number of inspections available in the dataset for each inspection point. Figures 1 and 2 show the “Average Gauge Widening” and “Average Increase in Gauge Widening since the First Inspection” versus “Average Number of Months since the First Inspection”, respectively.

As shown in Figures 1 and 2, the deterioration trend for inspection points for which data from at least 4 inspections is available is different to the other two lines. For instance, it has a smaller slope between the first and the second inspections. The reason could be because the first and second inspections for the other two groups (“2 Inspections” and “3 Inspections”) were made at a later stage in a track life cycle (when tracks were in bad conditions). Another insight from these two figures is that

Table 1. Summary of the prepared data used in the degradation analysis

Route

Number

Number of Inspection Points

Number of Records

Minimum Inspection Date

Maximum Inspection Date

57

847

1,329

12/12/2009

25/11/2013

59

3,170

5,131

12/12/2009

25/11/2013

70

2,082

3,337

13/12/2009

29/11/2013

75

2,059

2,948

13/12/2009

29/11/2013

Total

8,158

12,745

12/12/2009

29/11/2013

Figure 1. Deterioration trend for sections with different inspection numbers

Deterioration rate trend for sections with different inspection numbers

Figure 2. Deterioration rate trend for sections with different inspection numbers

the average number of months for the second inspection (“4 Inspections”) is around 6 months, whereas in the other two lines (“2 Inspections” and “3 Inspections”), it’s around 9-10 months.

 
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