Friction Control Methods Used by the Transit Industry (2005) / Chapter Skim
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16 CHAPTER 7 ONSITE INSPECTIONS OF INNOVATIVE APPROACHES TO NOISE CONTROL Three transit systems have recently implemented or demonstrated innovative methods and materials for friction control to mitigate noise and control wear: • Portland Tri-County Metropolitan Transportation District of Oregon (TriMet) , which has introduced the drilled-hole method of application.
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17 noise only for one curve. Figure 8 shows an overall view of one curve and the applicator system.
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18 installation of turnouts that would provide access for a new line extension in progress. During the turnout construction stage, a large (4-inch-diameter)
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19 the same amount of grease to be pumped out of the remaining ports, with the result of excessive grease being deposited at the fewer remaining open ports. In many cases, a single, large grease ball will be picked up by a passing wheel and either is flung onto the car body or falls to the ballast rather than being carried and deposited along the rail.
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20 (see Figure 16)
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21 the noise levels increase, but they return to normal after several trains have passed. Some clogging of delivery ports due to evaporation of the carrier has been reported, and, during early stages of the program, the material exhibited some settlement problems.
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22 7.4 RESULTS Although the above three transit systems were each inspected and evaluated, the TCRP panel chose Portland TriMet and NJT Newark Subway for demonstrations and measurements. These two systems had the least amount of information available about the performance of their innovative methods, and the panel wanted to increase information about those systems.
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