Lesson 1Track measures and shape limits (gauge, twist, alignment, cant, and cant deficiency) for 90 mphThis section defines track shape measures for 90 mph operation, including gauge, alignment, crosslevel, twist, cant, and cant deficiency, and explains checking methods, limits, and fixing maintenance actions.
Regulatory geometry limit frameworksGauge and alignment tolerance bandsCrosslevel, twist, and warp limitsCant and cant deficiency constraintsGeometry inspection and recording carsLesson 2Rail kinds and shapes: UIC/AREMA rules, head-hardened and premium railsThis section explains rail steel types, shapes, and rules, comparing UIC and AREMA sections, and detailing when to choose head-hardened or premium rails for curves, high loads, and faster passenger service.
Comparison of UIC and AREMA rail profilesRail steel grades and cleanlinessHead-hardened rail properties and usesPremium rail in curves and turnoutsRail wear, corrugation, and defect risksLesson 3Ballast makeup, drainage, ground preparation, and formation steadyingThis section looks at ballast, drainage, and formation design, covering material choice, sizing, dirt control, ground preparation, and steadying methods needed to support strong faster track structures.
Ballast gradation and quality criteriaBallast depth and shoulder designDrainage layers and underdrain systemsSubgrade assessment and improvementFormation stabilization and geosyntheticsLesson 4Track firmness, change zones, and track modulus effects on ride comfortThis section explains track firmness ideas, track modulus, and change zone design, showing how support changes affect ride comfort, moving loads, and long-term upkeep on faster lines.
Track modulus definition and estimationEffects of stiffness on vehicle responseBridge approaches and culvert transitionsEmbankment to cutting transition designMitigating differential settlement impactsLesson 5Rail shape and alignment ideas for 80–100 mph operationsThis section presents side and up-down alignment ideas for 80–100 mph operations, including curve design, change spirals, slopes, and links with vehicle movement, comfort, and upkeep needs.
Minimum curve radius for target speedsTransition spirals and comfort criteriaVertical curves, grades, and sag crestsInteraction with vehicle dynamics limitsGeometry design for maintainabilityLesson 6Rules and reference papers to check (AREMA, UIC leaflets, national track rules)This section reviews key world and national track rules, showing how AREMA, UIC, and local rules work together, and how engineers pick, understand, and use them for faster normal mainline projects.
Structure of AREMA track-related chaptersMain UIC leaflets for track and geometryNational standards for 80–100 mph linesReconciling conflicting standard requirementsUsing standards in specifications and contractsLesson 7Continuous welded rail (CWR): gains, holding methods, stressing steps, and neutral temperature ideasThis section details continuous welded rail actions, gains, and dangers, explaining holding methods, stressing and un-stressing steps, neutral temperature ideas, and papers needed for safe faster service.
Thermal forces and rail buckling riskFastening and ballast restraint needsCWR installation and welding stepsStressing and destressing proceduresNeutral temperature records and controlLesson 8Jointed track fixing: ways to replace, change details, and short fixesThis section covers plans to fix jointed track on faster routes, including replace planning, change design to CWR, short repair methods, and danger control during step building and traffic.
Condition assessment of jointed trackPrioritizing segments for remediationDesigning jointed-to-CWR transition zonesTemporary joint and bar repair methodsManaging speed restrictions during worksLesson 9Turnouts and passing loop track design for mixed traffic and faster speedsThis section addresses turnout and passing loop design for mixed traffic at faster speeds, covering shape, part choice, speed limits, and layout plans to balance space, safety, and upkeep ease.
Turnout geometry and speed classesSwitch, crossing, and closure rail typesHigher-speed diverging route designLoop length and siding arrangementTurnout maintenance and inspection needsLesson 10Sleepers/ties choice: wood, concrete, pre-stressed concrete, and fastening systemsThis section discusses sleeper and fastening system choice for faster lines, comparing wood and concrete choices, pre-stressing ideas, and how fastenings control gauge, firmness, noise, and upkeep needs.
Timber sleeper benefits and limitationsMonoblock and twin-block concrete tiesPrestressed concrete design basicsElastic fastenings and rail padsFastening choice and track stiffness
