Railway Track & Structures - April 2008 - (Page 21)

Figure 3, left, shows the progression of low railhead area loss for each inspection from the start of monitoring to the present, based on rail profile data for curves in the TOR zone. Figure 4 shows total wear head area loss (train and grinding) between pre- and post-grinding measurements. Curve P could not be accessed for wear measurements. Table 1, below, shows that the test curves in the TOR zone received fewer grinding passes than test curves located in the control zone. results. Note that curve F was located with an adjacent siding and is not included because the percent of traffic operating on the siding and main line is unknown. Table 1 shows that the test curves in the TOR zone received fewer grinding passes than test curves located in the control (GF only) zone. Figure 3 shows the progression of low railhead area loss for each inspection from the start of monitoring (38 mgt, January 2006) to the present (140 mgt, May 2007), based on rail profile data for curves in the TOR zone. Similar plots have been generated for high and low rails in both zones and for other wear parameters. The jump in wear between 122 mgt and 140 mgt shows the effect of rail grinding between pre- and post-grind measurements. Figure 4 shows the total head area loss for each curve in the TOR and the control zones between 122 mgt and 140 mgt, which is the wear from both grinding and train action. Table 2 summarizes the average wear for all curves in the TOR + GF zone and GF only zone. As Tables 1 and 2 show, the TOR zone not only was subjected to fewer grinding passes, but both high and low rails averaged less metal removal. Surface: Pre-post grinding Dye penetrant techniques were used for this inspection to document rail surface conditions and crack appearance. Results show reduced density and size of cracking on both high and low rails in the TOR zone when compared to identical rails from similar curves exposed to the same traffic in the GF only zone. Figures 5a and 5b show typical low rail photos after 95 mgt of traffic (before grinding) from the low rail in both zones. Figures 6a and 6b show the same sites after grinding. Similar results have been documented at most of www.rtands.com Railway Track & Structures April 2008 21 http://www.rtands.com

Table of Contents Feed for the Digital Edition of Railway Track & Structures - April 2008

Railway Track & Structures - April 2008 Contents On Track Industry Today Supplier News AREMA News NRC News TTCI R&D Railroads Seeking More Advanced Systems to Handle Materials SKOL Bounces Back From Summer Flood Landmark Railroad Bridges Need Inspection, Too Products and Literature People Calendar Sales Representatives Advertisers Index Website Directory Professional Directory Classified Advertising Chicago Perspective

Railway Track & Structures - April 2008

For optimal viewing of this digital publication, please enable JavaScript and then refresh the page. If you would like to try to load the digital publication without using Flash Player detection, please click here.