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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

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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