FixingWhat’sBroken:Implemen7ngCompa7bleWheel/Rail

ProfilesforTransit

–WymanJones,LAMetro

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SystemProblems•  Planners&PublicwantHighSpeedService•  DesignGroupsusegeneralrailstandards•  Manufacturerswanttosellstandardproducts•  TransitAgencieswantCostEffecBveDesigns•  LackofRailO&Mknowledgeofthedesigners•  TrackandVehiclenotcompaBbleinoperaBon•  FleetO&MCosts(15marriedpair)=$380,000peryear•  ExcessiveRailO&MCosts•  ExtensiveDownTimeorServiceDisrupBons

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SystemAcceptanceTes7ng•  SincetheSystemTesBngwasrequiredbeforetheNewHeavy

RailCarswereprovided,RTDacquiredloanofwhatwassaidtobeasimilarHeavyRailTransitCarforAcceptanceTesBng.

•  MiamiHeavyRailTransitVehicle(28”dia.Wheels)

•  DuringsystemtesBng.–  Showednowheelwear–  Noabnormalrailwear

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TheLAMetroTransitProblem•  ConBnuousbuild-upofmetalshavingsincurvesandswitchareas,

WheelFlangesrequiredtruingevery5,000to7,000miles.•  BREDAHeavyRailTransitVehicle•  (34½”dia.Wheels) (7’-7”AxleSpacing) (WheelsTossedaaer19,000miles)

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OriginalWheel/RailProblem•  OriginalAARStandard1:20Wheel

•  Resultedinlessthan19,000milesperwheel•  NotclosetoexpectedwheelLifeof200,000miles

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TypicalWheelProfileSolu7ons•  ChangetoAAR1BWornWheelProfile

•  ImprovedWheelLifetobetween20,000to25,000miles,sBllnotcloseto200,000miles

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Alterna7veWheel/RailSolu7on•  ChangewheelhardnessfromoriginalClass“A”hardnesstoaClass

“C”hardness.

•  TransferredWearProblemfromWheelWeartoRailWearcreaBngmoreO&MProblemsduetotrackdownBmeandServiceDelays.

•  A6Degree(955’Radius)Curvehadtobereplacedinlessthan2-yearsofoperaBon.

•  ReturnedtoaWheelHardnesscompromiseofaClass“B”hardnesswithslightlymorewheellifeandsBllanacceptablerailLife.

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ExcessiveRailWear•  ResultedinLAMetroacquiringare-furbishedFairmont-TamperRGH-16RailGrinder.

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Addi7onalWheel/RailSolu7on•  IntroducetheaddiBonofKelsanLCF(LowCoefficientof

FricBon)sBcklubricators.

•  Mountedinacassejebracketonallwheels.

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Ini7alLAMetroResults•  BychangingWheelProfiletoanAAR1BWornProfile,theWheelLifemovedfrom19,000milesperwheelto25,000miles.

•  ByaddingFlangeLubricatorstoallwheels,theWheelLifejumpedfrom25,000milesperwheelto75,000miles.

•  TheTradiBonalMiBgaBonMethodsdidnotprovideanysoluBontowardsa200,000mileexpectedwheellife.

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Needfor“OutsidetheBox”Solu7on•  DevelopedaSpecialTaskForcetoreviewdesignandOperaBngIssues.

•  RailCarwasdesignedfor:– HighSpeedOperaBon(150mphoperaBon)

– NotsuitablefortheBghtradiuscurvesrequiredintheLaMetroTunnelAlignment

•  NeedforCustomWheel/RailDesignSoluBon

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CustomWheel/RailProfiles•  CreatedaSpecialWheelProfiletoworkwithaCustomRailGrindingProgramforsystemcompaBbility.

•  WheelProfile=MetroCustomRESCOProfile

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CustomCurveRailGrindingProfiles•  CreatedaspecialsetofCustomRailGrindingTemplatesforCurveNegoBaBontosupporttheMetroCustomRESCOWheelProfile.

–  Curves>5,000feet=CPC.–  Curves<1,500feet=CPG&CPF–  Curves<1,000feetaddHRC

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CustomTangentRailGrindingTemplates

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LAMetroWheel/RailResults•  ExposedtheimportanceofacompleteRailSystemDesignwhichincorporatesbothvehicleandalignmentwithoperaBngexperience.

•  BysteppingoutsidethetradiBonalWheel/RailsoluBonseventheworstpossibleperformancecanbeobjecBvelyre-designedbyusingacustomWheel/RailInterface.

•  TheLAMetrohasbeenabletoachieveinexcessof500,000milesperwheelandminimumrailwearsincetheintroducBonofCustomProfiles.

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• HighSpeedCurvePerformance:(47mphto53mph)

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•  Exis7ngVehiclePerformanceEvalua7on:

– OnHighSpeedCurvedTrack•  LiWletoNoFlangeContact•  NoexcessiveNoiseIssuesthroughcurvedtrack

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• HighSpeedTangentPerformance:(53mphto69mph)

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•  Exis7ngVehiclePerformanceEvalua7on:– OnHighSpeedTangentTrack

•  LiWletoNoHun7ng•  NoapparentNoiseIssuesontangenttrack

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•  Exis7ngVehiclePerformanceEvalua7on:– OnHighSpeedTangentTrack

•  LiWletoNoHun7ng•  NoapparentNoiseIssuesontangenttrack

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ThisConcludesthePresentaBon