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OCR for page 65
65 APPENDIX B Glossary AAR Association of American Railroads. 2 Vehicles with conventional motor and trailer ADA Americans With Disabilities Act 1991. Legis- trucks at ends but unconventional center lation regarding access to transit by persons trucks. with disabilities. 3 Vehicles with innovative motored and trailing AOA/Angle The angle between the track radial line and running gear throughout of Attack the centerline of the wheelset's axle. This is Contact angle Angle of the plane of contact between the the same as the angle between the axis of rota- wheel and rail relative to the track plane. tion of the wheelset and a line perpendicular Contact stress The force acting per unit area at the point of to the track centerline (which is an alternative contact between wheel and rail. definition). Conicity The self-steering capability of a wheelset APTA American Public Transportation Association. resulting from the taper on the wheel treads. Axle Arrangements: dBA Decibels (Weighted) - Unit of noise measure- 1 Two-wheel axle that is fixed in the truck ment, weighted to represent sensitivity of frame. human ear to sound. 1 Two-wheel axle that can rotate within the DBOM Design, Build, Operate and Maintain. truck frame. EEF Einzelrad-Einzel-Fahrwerk wheelsets, self- B Monomotor, four-wheel truck with fixed steering and independently rotating wheels. axles. Flange angle The angle between the contact face of the B Monomotor, four-wheel truck with axles that wheel face and a vertical line parallel with the can rotate within the truck frame. back of the wheel. Bo Bimotor, four-wheel truck with fixed axles. Flangeway The clearance between the gauge side of a rail Bo Bimotor, four-wheel truck with axles that can and a restraining rail or the equivalent part of rotate within the truck frame. a girder rail or switch. 2 Four-wheeled trailer truck with fixed axles. FTA Federal Transit Administration. 2 Four-wheeled trailer truck with axles that can IRW Independently Rotating Wheels. A pair of rotate within the truck frame. wheels on a common axle that rotate inde- Bochum Proprietary name for a resilient wheel that has pendently of each other. a flexible web element between the axle and L/V Ratio The ratio of lateral to vertical wheel/rail con- the rim. tact forces that influence derailment. BOStrab German Transit Standards. LFLRV Low-Floor Light Rail Vehicle. Buff load The static longitudinal force that a rail vehi- LRT Light Rail Transit--refers to an operator or cle must be capable of withstanding without system using light rail vehicles. permanent deformation to its primary LRV Light rail vehicle. structure. Kelsan Proprietary name of a type of grease applicator. CategoryReference to definitions applied in TCRP Report 2: KS Kinki Sharyo (vehicle supplier). 1 Vehicles with conventional motor and trailer PCC President's Conference Committee (type of trucks throughout. streetcar).

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66 Penn Pennsylvania Rail Road Station in Newark, NJT New Jersey Transit, Newark, NJ. New Jersey. RATP Parisian Autonomous Transportation System, PLF Partial Low Floor. Paris, France. Portec Proprietary name of a type of wayside grease SDT San Diego Transit, CA. applicator. SEPTA Southeastern Pennsylvania Transportation REBS Proprietary name of a type of grease manu- Authority, Philadelphia, PA. factured in Germany. SNCF French National Railways. Rolling The deformation and damage on a wheel or TriMet Tri-County Metropolitan Transportation Dis- Contact rail caused by the repetitive experience of trict, Portland, OR. Fatigue normal and tangential forces. TTC Toronto Transit Commission; Toronto, S&C Switches and Crossings (Special Trackwork). Ontario, Canada. TRIS Transportation Research Information Service. UITP International Public Transport Association. TTCI Transportation Technology Center, Inc. VBZ Zurich Transportation Authority, Zurich, VDV German Public Transit Operator's Association. Switzerland. Transit Authorities VDV German Association of Public Transport DART Dallas Area Rapid Transit. Operators. HBL Hudson Bergen Line (part of NJT). VTA Valley Transportation Authority, Santa MAX Metropolitan Area Express (part of TriMet). Clara, CA. MBTA Massachusetts Bay Transportation Authority, Boston, MA.