Guidance for Developing a Transit Asset Management Plan (2014) / Chapter Skim
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65 Introduction The following chapter includes two, step-by-step tutorials illustrating the use of TAPT using two fictitious transit agencies as examples. They provide users with applications of the tool, and will help transit agency staff see how to apply the tool to their assets.
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66 Guidance for Developing a Transit Asset Management Plan Before entering data, first review the software guidance. Based on the information provided, develop a list of the data that will be required to effectively use the tool.
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TAPT Tutorials 67 Figure 4.1. TAPT Start Screen.
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68 Guidance for Developing a Transit Asset Management Plan Figure 4.3. Create an Asset Group.
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TAPT Tutorials 69 The next steps require entering NTD data for Hybrid buses. The data that MST currently reports to NTD combines statistics for hybrid and diesel buses; therefore, you must disaggregate the data for the two fleets before continuing.
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70 Guidance for Developing a Transit Asset Management Plan Diesel Buses The next step is to enter the data for the diesel bus fleet by creating a second Vehicle Model.
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TAPT Tutorials 71 Figure 4.8. Diesel Bus Vehicle Model Parameters.
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72 Guidance for Developing a Transit Asset Management Plan Demand Response Vans The last model that you create is a Vehicle Model for the Demand Response fleet.
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TAPT Tutorials 73 Unconstrained Scenario After all of the vehicle data has been entered, you are ready to begin running the model to determine the program for MST. The first step is to run an unconstrained program.
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74 Guidance for Developing a Transit Asset Management Plan Click Display Summary Table and select the "Unconstrained" run before clicking Display Summary Table (Figure 4.16)
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TAPT Tutorials 75 Figure 4.14. Run Prioritization Model.
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76 Guidance for Developing a Transit Asset Management Plan Figure 4.16. Display Summary Table.
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TAPT Tutorials 77 Scenarios Initial Value Value in 2025 Unconstrained Remaining Backlog $ 6,327,112 $ 0 Cumulative Spent - $ 14,379,040 MDBF (miles) 4,300 5,995 Passenger Delay (hours)
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78 Guidance for Developing a Transit Asset Management Plan Do Nothing Scenario Next, create a scenario for MST with no budget to understand how assets would deteriorate if no funding was available.
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TAPT Tutorials 79 Figure 4.21. Do Nothing Scenario Summary Results.
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80 Guidance for Developing a Transit Asset Management Plan 14. Input the following information to create two charts, showing conditions between 2016 and 2025 in a "Do Nothing" scenario: • Chart One, shown in Figure 4.23, with the Prioritization Model Output Variable selected as "Needs ($)
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TAPT Tutorials 81 • Demand response vehicle 3 is replaced in 2019 • Diesel bus fleet 4, containing 4 vehicles, is replaced in 2023 • Diesel bus fleet 5, containing 6 vehicles, is replaced in 2023 • Demand response vehicle 2 is replaced in 2024 • Hybrid bus fleet 4, containing 2 vehicles, is replaced in 2024 Summary Results for this scenario, as compared to previous scenarios, are shown in Table 4.10. In addition to reviewing the summary results, you also create a series of graphs to show the effects of the program over time.
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82 Guidance for Developing a Transit Asset Management Plan not a noticeable decrease in the MDBFs (see Figure 4.26) , as the average MDBF only decreased by approximately 200 miles.
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TAPT Tutorials 83 you will be responsible for adjusting the investment scenarios to arrive at an optimized plan for MST. Adjusted Program Scenario After determining that replacing diesel buses is an agency priority, you return to the vehicle model for diesel buses.
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84 Guidance for Developing a Transit Asset Management Plan Table 4.12 shows the results of the adjusted program scenario compared to the annual budget scenario.
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TAPT Tutorials 85 10. Input the following information to create two additional charts: • Chart One, shown in Figure 4.31, with the Prioritization Model Output Variable selected as "Mean Distance Between Failures (miles)
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86 Guidance for Developing a Transit Asset Management Plan believes that maintaining a hybrid fleet will have long-term benefits, both to the agency and to the environment. When the analysis has been completed, you bring the results to the agency executives, who approve the Adjusted Program scenario for the TAMP.
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TAPT Tutorials 87 At present STA has a fleet of 270 buses. The majority of the fleet was purchased in 2000 with a federal grant, but the agency recognizes that these buses will soon need to be replaced.
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88 Guidance for Developing a Transit Asset Management Plan Bus For buses, you consult STA staff and together choose to use the defaults for the majority of inputs. Beyond NTD data and cost histories, the agency has limited historical data that could be used to override the model defaults.
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TAPT Tutorials 89 Figure 4.34. Create Asset Group.
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90 Guidance for Developing a Transit Asset Management Plan Figure 4.36. Bus Vehicle Model Inventory Description.
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TAPT Tutorials 91 Vehicle Data from the National Transit Database Value Passenger Miles 116,800 Unlinked Trips 18,900 Vehicle Miles 12,800 Revenue Vehicle Miles 9,900 Revenue Vehicle Hours 850 Number of Road Calls 320 Gallons of Fuel for Vehicle Operations 2,600 Vehicle Maintenance Cost 15,700 Additional Vehicle Data Value New Vehicle Cost ($) 384,000 Table 4.15.
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92 Guidance for Developing a Transit Asset Management Plan Accumulated Mileage Number of Vehicles Project Code 1,143,000 6 LightRail01 992,800 8 LightRail02 768,900 7 LightRail03 439,400 15 LightRail04 414,200 10 LightRail05 289,200 12 LightRail06 117,600 20 LightRail07 24,800 18 LightRail08 Table 4.16. Light Rail Inventory Inputs.
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TAPT Tutorials 93 To increase the expected lifecycle of light rail assets, STA has decided to perform midlife overhauls on the cars. To incorporate rehabilitation into the model, you set the cost of rehabilitating a vehicle to reflect what the agency is currently paying for rehab actions.
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94 Guidance for Developing a Transit Asset Management Plan 13. Review the Summary Results and note that the Average Annual Cost is $921,034 and the Cost-Minimizing Replacement Mileage is 1,606,000 (or 22 years)
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TAPT Tutorials 95 Curved Track 21. Create a new asset category for tangent curved track: • Asset Group ID Code: Track (Curved)
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96 Guidance for Developing a Transit Asset Management Plan 23. Review the Summary Results to ensure that the Average Annual Cost is $89.11 and the Cost-Minimizing Replacement Age is 27 years.
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TAPT Tutorials 97 • Asset Units of Measure: lineal feet • Inventory Description and Additional Parameters: Use the inputs from Table 4.23 29. Review the Summary Results to ensure that the Average Annual Cost is $88.35 and the Cost-Minimizing Replacement Age is 23 years.
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98 Guidance for Developing a Transit Asset Management Plan 32. Review the Summary Results to ensure that the Average Annual Cost is $447.58 and the Cost-Minimizing Replacement Age is 14 years.
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TAPT Tutorials 99 square feet, you adjust the replacement costs to reflect the cost of replacing a square foot of building. • You adjust the Maintenance Annual Costs to reflect the units used in the model and historical maintenance costs.
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100 Guidance for Developing a Transit Asset Management Plan Figure 4.45. Maintenance Facilities Model.
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TAPT Tutorials 101 48. Input the following information into the model: • Asset Type: Facilities-Building Utilities • Asset Description: HVAC • Asset Units of Measure: square feet • Inventory Description and Additional Parameters: Use the inputs from Table 4.29 49.
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Age Units (sq ft) Description Pipeline Year 1 3,600 HVAC-Maint01 23 3,750 HVAC-Maint02 1 33,200 HVAC-Maint03 27 5,300 HVAC-Maint04 24 18,500 HVAC-Maint05 27 4,800 HVAC-Maint06 27 41,400 HVAC-Maint07 5 6,200 HVAC-Maint08 1 150 HVAC-Maint09 16 45,200 HVAC-Maint10 34 9,700 Project01 2018 8 6,100 HVAC-Admin01 2 16,400 HVAC-Admin02 34 9,100 HVAC-Admin03 1 3,400 HVAC-Admin04 Asset Replacement Costs Value Agency Replacement Cost ($)
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TAPT Tutorials 103 Roof STA maintains condition data for roof assets maintained by the Authority. The condition data is collected based on a five-point scale used by TERM Lite.
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104 Guidance for Developing a Transit Asset Management Plan Results: Springfield Transit Authority Unconstrained Scenario When all of the data inputs had been specified, you return to the Budgets and Parameters worksheet. The agency first wanted to run the prioritization model with an unconstrained budget to better understand the full extent of the agency's needs and to understand how the model would prioritize replacement projects if funding was not a factor.
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TAPT Tutorials 105 Figure 4.48. Roof Condition Model.
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106 Guidance for Developing a Transit Asset Management Plan • Even with an unconstrained budget, passenger delay will increase somewhat over time, and MDBF will decrease. This is largely a result of the projected increase in age of light rail vehicles (many of which are now relatively new)
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TAPT Tutorials 107 • Chart Two, shown in Figure 4.52, with the Prioritization Model Output Variable selected as "Average Condition Rating" and the Run "Unconstrained." Do Nothing Scenario Next, you run a scenario where no work is performed, to determine the worst-case scenario if all assets were allowed to deteriorate over a 20-year period. This will provide a comparison to the unconstrained program and also illustrates the effects of asset deterioration.
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108 Guidance for Developing a Transit Asset Management Plan Table 4.34 shows the summary results of the Do Nothing scenario compared to the Unconstrained scenario, showing the condition of the assets in 20 years in a best-case scenario where all assets are replaced as needed and the worst-case scenario where no replacement activity is programmed. In the Do Nothing program, you note a significant decrease the mean distance between failures (see Figure 4.54)
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Scenarios Initial Value Value in 2032 Do Nothing Unconstrained Remaining Backlog $ 45,985,188 $ 911,259,738 $ 0 Cumulative Spent - $ 14,266,275 $ 1,063,478,425 MDBF (miles) 32,553 6,344 30,403 Average TERM Condition (nonvehicle Assets)
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110 Guidance for Developing a Transit Asset Management Plan $35M Annual Budget Scenario After reviewing the previous results, input the agency's approximate annual capital asset replacement budget of $35,000,000. Table 4.35 shows the results of this analysis compared to other scenarios.
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TAPT Tutorials 111 Figure 4.57. STA Annual Budget Scenario Summary Results.
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112 Guidance for Developing a Transit Asset Management Plan After assessing the summary data, you review the suggested program. On the program list, you observe the following: • Some roof projects are being programmed for replacement twice during the 20-year analysis-period.
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TAPT Tutorials 113 to be performed on all systems of the building. You decide only to group projects that have been programmed in the $35M annual scenario to ensure that the initial results are not changed significantly.
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114 Guidance for Developing a Transit Asset Management Plan spent over the 20-year period increased a little over $1M dollars. While there was no change in the majority of projects programmed, there were 23 roof replacement projects in the Adjusted Program, as opposed to 27 roof replacements in the Annual Scenario.
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TAPT Tutorials 115 Program Year Asset Description Project Code Units Cost Project Rank PI 2025 Roof Roof-Maint02 3,750 $ 77,813 1 0.0823 2025 Roof Roof-Maint10 45,200 $ 937,900 2 0.0823 2025 Guideway GuideXC04 2,500 $ 7,852,500 3 0.0093 2025 Track (Tangent Ballasted) TrackBL01 11,000 $ 7,029,000 4 0.0053 2025 Track (Tangent Curved)
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$20 13 20 14 20 15 20 16 20 17 20 18 20 19 20 20 20 21 20 22 20 23 20 24 20 25 20 26 20 27 20 28 20 29 20 30 20 31 20 32 Figure 4.61. Comparing STA Needs ($)
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