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Making the Case for Long Travel Constant Contact Side Bearings

January 3, 2014 | Filed under: Vehicle Design, Vehicle/Track

by Bill O’Donnell • July 4, 2005 As part of its efforts to reduce the stress state on North American railroads, the Association of American Railroads (AAR) mandated that all new cars ordered after January 1, 2002, must be equipped with constant contact side bearings. Constant contact side bearings (CCSBs) raise the threshold …

FRA Initiatives: Dr. Magdy El-Sibaie, Chief of FRA’s Track Research Division

January 3, 2014 | Filed under: Maintenance, Measurement Systems, Track Geometry, Vehicle/Track

By Bob Tuzik • May 26, 2005 The Federal Railroad Administration’s Office of Research and Development is not the best known R&D organization in the industry, but it is one of the most important. It’s work figures prominently in rulemaking and the regulatory process for the industry. That role is …

Specialized Rail Profile Grinding on MBTA

January 3, 2014 | Filed under: Rail Grinding, Rail Maintenance, Rail Transit, Wheel/Rail Interaction, Wheel/Rail Profile

by Bob Tuzik • April 10, 2005 Rail Grinding has been used to solve a host of problems on transit systems. It recently was used in Boston to remove a new wrinkle. A specialized grinding program was initiated in 2002 on the heels of a series of light-rail derailments on the …

Practical Rail Grinding

January 3, 2014 | Filed under: Rail Grinding, Rail Maintenance

by Fred Prahl, Eric Magel & Peter Sroba • April 4, 2005 Rail grinding, first developed as a technique for treating corrugations, has become an essential component of track maintenance for freight railroads and transit properties. During the 1960s, railroads began seeing rail corrugations developing to depths of about 0.080 to …

Vehicle Side Bearings: Function, Performance and Maintenance (Part 2 of 2)

January 3, 2014 | Filed under: Gary Wolf, Vehicle Design, Vehicle/Track

By Gary Wolf • May 04, 2005 Part 1 of this two-part article explored the importance of roller style side bearings in maintaining proper vehicle performance and how improper maintenance of side bearings can directly affect wheel/rail forces. Part 2 examines the purpose, types of designs and maintenance of the …

Preventing Track Buckles

January 3, 2014 | Filed under: Gary Wolf, Heavy Haul, Rail Maintenance

By Gary Wolf • March 10, 2005 With the approach of spring, a trackman’s thoughts turn to the potential for sun kinks. Some call them thermal misalignments, some call them track buckles, some call them sun kinks. But no matter what you call them, their effects can be characterized in …

Reducing Noise and Vibration on NYCT

January 3, 2014 | Filed under: Friction Management, Noise and Vibration, Rail Transit, Vehicle Design, Vehicle/Track

by Bob Tuzik, January 1, 2005 Any problem affecting the New York City Transit is by default a big problem. The process of transporting more than four million passengers per day in 6,000 vehicles on more than 700 miles of elevated, underground at-grade mainline tracks, on a system that operates 24 hours …

Vehicle Side Bearings: Function, Performance and Maintenance (Part 1 of 2)

January 3, 2014 | Filed under: Gary Wolf, Vehicle Design, Vehicle/Track

By Gary Wolf • April 04, 2005 Side Bearings serve as support elements on the truck bolster and are located to the side of the centerplate. The function of the side bearing is to support the underside of the car body bolster in the event the car leans to one side …

Rock ’til You Drop: Starting and Stopping Harmonic Rock and Roll

January 3, 2014 | Filed under: Gary Wolf, Rail Maintenance, Track Geometry, Vehicle/Track

By Gary Wolf • February 1, 2005 It’s said that “it takes two to tango,” but it takes three critical elements to induce harmonic rock and roll: Like many of the other legendary “rockers,” freight car rock and roll came to the forefront in the ‘70s. The introduction of high-center-of-gravity, 100-ton …

Drilling Down to Top-of-Rail Friction Control

January 3, 2014 | Filed under: Friction Management, Rail Transit

by Bob Tuzik February 1, 2005 There are two primary approaches to friction management on rail transit systems: onboard and wayside. The most effective method depends upon the demands of the system. A relatively small system with consistent degrees of curvature, for example, might lend itself to onboard application. A system with …

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