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65 AAR Association of American Railroads. ADA Americans With Disabilities Act 1991. Legis- lation regarding access to transit by persons with disabilities. AOA/Angle The angle between the track radial line and of Attack the centerline of the wheelsetâs axle. This is the same as the angle between the axis of rota- tion of the wheelset and a line perpendicular to the track centerline (which is an alternative definition). APTA American Public Transportation Association. Axle Arrangements: 1 Two-wheel axle that is fixed in the truck frame. 1´ Two-wheel axle that can rotate within the truck frame. B Monomotor, four-wheel truck with fixed axles. B´ Monomotor, four-wheel truck with axles that can rotate within the truck frame. Bo Bimotor, four-wheel truck with fixed axles. Bo´ Bimotor, four-wheel truck with axles that can rotate within the truck frame. 2 Four-wheeled trailer truck with fixed axles. 2´ Four-wheeled trailer truck with axles that can rotate within the truck frame. Bochum Proprietary name for a resilient wheel that has a flexible web element between the axle and the rim. BOStrab German Transit Standards. Buff load The static longitudinal force that a rail vehi- cle must be capable of withstanding without permanent deformation to its primary structure. CategoryâReference to definitions applied in TCRP Report 2: 1 Vehicles with conventional motor and trailer trucks throughout. 2 Vehicles with conventional motor and trailer trucks at ends but unconventional center trucks. 3 Vehicles with innovative motored and trailing running gear throughout Contact angle Angle of the plane of contact between the wheel and rail relative to the track plane. Contact stress The force acting per unit area at the point of contact between wheel and rail. Conicity The self-steering capability of a wheelset resulting from the taper on the wheel treads. dBA Decibels (Weighted) - Unit of noise measure- ment, weighted to represent sensitivity of human ear to sound. DBOM Design, Build, Operate and Maintain. EEF Einzelrad-Einzel-Fahrwerk wheelsets, self- steering and independently rotating wheels. Flange angle The angle between the contact face of the wheel face and a vertical line parallel with the back of the wheel. Flangeway The clearance between the gauge side of a rail and a restraining rail or the equivalent part of a girder rail or switch. FTA Federal Transit Administration. IRW Independently Rotating Wheels. A pair of wheels on a common axle that rotate inde- pendently of each other. L/V Ratio The ratio of lateral to vertical wheel/rail con- tact forces that influence derailment. LFLRV Low-Floor Light Rail Vehicle. LRT Light Rail Transitârefers to an operator or system using light rail vehicles. LRV Light rail vehicle. Kelsan Proprietary name of a type of grease applicator. KS Kinki Sharyo (vehicle supplier). PCC Presidentâs Conference Committee (type of streetcar). A P P E N D I X B Glossary
Penn Pennsylvania Rail Road Station in Newark, New Jersey. PLF Partial Low Floor. Portec Proprietary name of a type of wayside grease applicator. REBS Proprietary name of a type of grease manu- factured in Germany. Rolling The deformation and damage on a wheel or Contact rail caused by the repetitive experience of Fatigue normal and tangential forces. S&C Switches and Crossings (Special Trackwork). TRIS Transportation Research Information Service. TTCI Transportation Technology Center, Inc. VDV German Public Transit Operatorâs Association. Transit Authorities DART Dallas Area Rapid Transit. HBL Hudson Bergen Line (part of NJT). MAX Metropolitan Area Express (part of TriMet). MBTA Massachusetts Bay Transportation Authority, Boston, MA. NJT New Jersey Transit, Newark, NJ. RATP Parisian Autonomous Transportation System, Paris, France. SDT San Diego Transit, CA. SEPTA Southeastern Pennsylvania Transportation Authority, Philadelphia, PA. SNCF French National Railways. TriMet Tri-County Metropolitan Transportation Dis- trict, Portland, OR. TTC Toronto Transit Commission; Toronto, Ontario, Canada. UITP International Public Transport Association. VBZ Zurich Transportation Authority, Zurich, Switzerland. VDV German Association of Public Transport Operators. VTA Valley Transportation Authority, Santa Clara, CA. 66