Railway Track & Structures - December 2008 - (Page 22) TTCI R&D Table 1, left, shows failure types by percentage for each weld type. Figure 3 shows a typical weld shelling failure. fastening systems on new wood ties, new concrete ties and plastic and wood ties that have been in track for several years are being evaluated on the six-degree curve shown in Figure 2. The new ties have accumulated little tonnage thus far. Baseline measurements have quantified as-installed gauge strength and clip holddown forces. Long-term observations and monitoring will allow the evaluation of the performance of the ties and fastening components under HAL traffic. Results from initial measurements revealed no surprises. The wood and plastic ties with previous HAL tonnage have lower gauge strength than newly installed components. New wood ties with direct fixation fastening systems have gauge strength that is similar to the new concrete ties. Fastening systems installed on softwood ties showed higher lateral deflections than similar fasteners installed on hardwood ties. Results of the new tests will be fully-reported when sufficient tonnage has been accumulated. Two types of plastic ties are being tested on a coal line in the eastern U.S. as part of the AAR/FRA HAL Revenue Service Test. The ties have accumulated about 200 mgt and results have been similar to earlier results from FAST. The ties are more susceptible to cracking during spiking if there are no pilot holes or if the pilot holes are too small. The plastic ties also tend to pump (deflect vertically) more than wood ties, because they are not as stiff in bending. The increased pumping has been observed to result in more ballast movement. Two types of elastic fasteners are also being tested at the eastern revenue service test. Results have also been consistent with 22 Railway Track & Structures December 2008 www.rtands.com http://www.aar.com http://www.rtands.com
Table of Contents Feed for the Digital Edition of Railway Track & Structures - December 2008 Railway Track & Structures - December 2008 Contents On Track Industry Today Supplier News AREMA News NRC News TTCI R&D Hand-Held Tools Continue Big Role in Railroad Engineering AREMA C&S Moving Ahead Optimizing Winter Speed Restrictions RTA 2008 Conference Makes Splash in Savannah, Ga. Products and Literature People Calendar Sales Representatives Advertisers Index Website Directory Professional Directory Classified Advertising Chicago Perspective Railway Track & Structures - December 2008 Railway Track & Structures - December 2008 - Railway Track & Structures - December 2008 (Page Cover1) Railway Track & Structures - December 2008 - Railway Track & Structures - December 2008 (Page Cover2) Railway Track & Structures - December 2008 - Contents (Page 1) Railway Track & Structures - December 2008 - Contents (Page 2) Railway Track & Structures - December 2008 - On Track (Page 3) Railway Track & Structures - December 2008 - On Track (Page 4) Railway Track & Structures - December 2008 - Industry Today (Page 5) Railway Track & Structures - December 2008 - Industry Today (Page 6) Railway Track & Structures - December 2008 - Supplier News (Page 7) Railway Track & Structures - December 2008 - Supplier News (Page 8) Railway Track & Structures - December 2008 - Supplier News (Page 9) Railway Track & Structures - December 2008 - Supplier News (Page 10) Railway Track & Structures - December 2008 - Supplier News (Page 11) Railway Track & Structures - December 2008 - AREMA News (Page 12) Railway Track & Structures - December 2008 - AREMA News (Page 13) Railway Track & Structures - December 2008 - AREMA News (Page 14) Railway Track & Structures - December 2008 - AREMA News (Page 15) Railway Track & Structures - December 2008 - AREMA News (Page 16) Railway Track & Structures - December 2008 - NRC News (Page 17) Railway Track & Structures - December 2008 - NRC News (Page 18) Railway Track & Structures - December 2008 - NRC News (Page 19) Railway Track & Structures - December 2008 - TTCI R&D (Page 20) Railway Track & Structures - December 2008 - TTCI R&D (Page 21) Railway Track & Structures - December 2008 - TTCI R&D (Page 22) Railway Track & Structures - December 2008 - TTCI R&D (Page 23) Railway Track & Structures - December 2008 - Hand-Held Tools Continue Big Role in Railroad Engineering (Page 24) Railway Track & Structures - December 2008 - Hand-Held Tools Continue Big Role in Railroad Engineering (Page 25) Railway Track & Structures - December 2008 - Hand-Held Tools Continue Big Role in Railroad Engineering (Page 26) Railway Track & Structures - December 2008 - Hand-Held Tools Continue Big Role in Railroad Engineering (Page 27) Railway Track & Structures - December 2008 - Hand-Held Tools Continue Big Role in Railroad Engineering (Page 28) Railway Track & Structures - December 2008 - Hand-Held Tools Continue Big Role in Railroad Engineering (Page 29) Railway Track & Structures - December 2008 - Hand-Held Tools Continue Big Role in Railroad Engineering (Page 30) Railway Track & Structures - December 2008 - Hand-Held Tools Continue Big Role in Railroad Engineering (Page 31) Railway Track & Structures - December 2008 - Hand-Held Tools Continue Big Role in Railroad Engineering (Page 32) Railway Track & Structures - December 2008 - Hand-Held Tools Continue Big Role in Railroad Engineering (Page 33) Railway Track & Structures - December 2008 - AREMA C&S Moving Ahead (Page 34) Railway Track & Structures - December 2008 - AREMA C&S Moving Ahead (Page 35) Railway Track & Structures - December 2008 - Optimizing Winter Speed Restrictions (Page 36) Railway Track & Structures - December 2008 - Optimizing Winter Speed Restrictions (Page 37) Railway Track & Structures - December 2008 - Optimizing Winter Speed Restrictions (Page 38) Railway Track & Structures - December 2008 - Optimizing Winter Speed Restrictions (Page 39) Railway Track & Structures - December 2008 - Optimizing Winter Speed Restrictions (Page 40) Railway Track & Structures - December 2008 - RTA 2008 Conference Makes Splash in Savannah, Ga. (Page 41) Railway Track & Structures - December 2008 - Products and Literature (Page 42) Railway Track & Structures - December 2008 - Products and Literature (Page 43) Railway Track & Structures - December 2008 - People (Page 44) Railway Track & Structures - December 2008 - Sales Representatives (Page 45) Railway Track & Structures - December 2008 - Advertisers Index (Page 46) Railway Track & Structures - December 2008 - Website Directory (Page 47) Railway Track & Structures - December 2008 - Professional Directory (Page 48) Railway Track & Structures - December 2008 - Classified Advertising (Page 49) Railway Track & Structures - December 2008 - Classified Advertising (Page 50) Railway Track & Structures - December 2008 - Classified Advertising (Page 51) Railway Track & Structures - December 2008 - Chicago Perspective (Page 52) Railway Track & Structures - December 2008 - Chicago Perspective (Page Cover3) Railway Track & Structures - December 2008 - Chicago Perspective (Page Cover4)
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