Railway Track & Structures - September 2008 - (Page 36)

TTCI R&D LTLF 9K IPS Loa d Ba se, Averag e (Lo w Rail ) 0.030 . 0 MGT I 0.025 g 20 61 MGT C 54 96 MGT 0 00 68 MGT , 0.020 0 ,010 0 ,005 o Figure 3, left, is the zone show ing new clips and test insulators placed on ties prior to installation. Figure 4 is the lateral displacement at 9-kip load for ea ch insulator type. inserts or different clips/p ads will not be evaluated und er this pro gram. Test site T he AA R and th e U P selected a site on a 1a- deg ree c u rve o n th e M ohave subd ivis io n, lo cat ed in th e T eh achapi grade area in Ca liforn ia. The pr imary test curve for thi s evaluation is located in an area th at r ecei ves o n ly ga uge fac e lubri cati on. A second 1a- deg ree cu rve was selected as a control zo ne in the area where top -of-rail friction control is being implemented. A co ntrol zo ne cons ist ing of new, cu rrent ly- use d ins u lato rs was installed to evaluate their perfo rmance in an area with red uce d lat eral loadin g, a benefit of applyi ng TOR friction co ntro l. T he prima ry tes t curve was co nfigu red with five segme nts of insulators, as Figure 1 shows. Insulato r segments A, B, C and D are each 50 ties long, whereas segment G is 100 t ies lo ng a n d has the sa me insulators used in th e control zone. The addit io na l l00- tie segment of co ntro l insulators is located in the TOR zone and is shown as zone X. Insulator var iations for thi s test were se lected by U P ba sed o n lah o rat nr y resu lts of imp ro ved materi als. All test samp les, except for mater ials used in t he cont r o l zo ne, were p ro vid ed as a coo perative program by suppliers. Performance measurements In su la t o r p erfor m an ce is b ein g m oni t ored b y vis ua l a nd m easured met h od s. Meas ure d p e rfo r man ce is obtai ned by mo nitori ng lo ad ed gauge restrai nt at th e hea d and base an d b y measuri ng fastener toe load. 1,000- p ou nd inc re me nts u n til 9, 000 pound s is ob t ai n ed. t-' A s in su la t or performance degrad es afte r tonnage or time in track, the resulti ng railhead and base deflection s measured under the full load will increase. Th e amo unt of base tr an sl ati on is es pec ia lly se ns it ive t o insulator wear and deformation . Fastener toe load Du rin g inst allation, new clips were installed at each locatio n. Wh ile the toe lo ad is p r im a r il y a m easu r e o f cli p performance, th e effec t fro m insu lato r wear m a y a lso b e d ete rmi n ed b y measuring cha nges in clip perfo rman ce. l oaded gauge widening By applying a lateral load between th e rails and measuring the resulting railhead and base deflections, an overall indication of track strength can be obtaine d. TIel's Li gh t w ei gh t T r ack L o adi n g f ixt u re (LTLF) facilitates thi s type of measu rement at spot locations. Th e LTLf is con figured to app ly a lateral load bet ween t h e r ails . T he load in g m ec hanis m is placed between the t ail (F igure 2), after w h ich t he lat er al load is increased in Installation, baseline character At t he start of t he t est , n e w test insulato rs and new clips were distribut ed along the ties and installed by UP ttack crews, Fig u re 3 . Afte r r em ovi n g the existing insulato r, the area betwe en rail and cast inserts was cleaned of any debris o r dirt, after w hic h ma t er ials were installed. Installation by machine was no t feasible du e to th e short test zones. 3535 Torsion Ride Rail Gear • • • • • 3535 Rail Gear kits fit trucks up to 28,000 GVW. Rail Gear automatically locks when raised or lowered. Front and rear Rail Gear assemblies are identical. Hardened forged rail wheels. Popular options include disc brakes and rail shunts. Call us Toll Free at 888-553-5047 or visit our website www.Mitchell-Railgear.com 36 Railway Track & Structures 0 September 2008 www.rtands.com http://www.aar.com http://www.rtands.com

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Railway Track & Structures - September 2008 Contents On Track Industry Today Supplier News AREMA News NRC News TTCI R&D Larry Etherton Rounds Out Successful Term as President of AREMA Remote Bridges Present Challenges New Mexico Rail Runner Express Making Tracks for Santa Fe Products and Literature People Calendar Sales Representatives Advertisers Index Website Directory Professional Directory Classified Advertising Chicago Perspective

Railway Track & Structures - September 2008

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