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Bob Tuzik

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 …

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 …

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 …

Rail Fixation Reduces Vibration

January 3, 2014 | Filed under: Noise and Vibration, Rail Transit

by Bob Tuzik, January 1, 2005 When NYCTA wanted a new fastener that was 35% “softer” than the softest DF fastener it had in use, a fastener that would not raise the track by more than 1-1/8 inches (30 mm), Dynamic Engineering designed the APT-BF system. The APT-BF fastener incorporates two elastic …

Flange Climb and Independently Rotating Wheels

January 3, 2014 | Filed under: Rail Transit, Vehicle/Track, Wheel/Rail Interaction, Wheel/Rail Profile

by Bob Tuzik, December 1, 2004 Investigations have shown that wheel-flange/gauge-face angle and the coefficient of friction (COF) play significant roles in contributing to or preventing flange-climb derailments. Investigations have also shown that Light Rail Vehicles with Independently Rotating Wheels (IRWs) have a greater propensity for flange-climb derailment than vehicles with conventional …

Designing Amtrak’s Wayside Train/Track Interaction Detection System

January 3, 2014 | Filed under: Measurement Systems, Rail Transit, Vehicle/Track

by Bob Tuzik, December 1, 2004 As part of its effort to monitor dynamic vehicle/track interaction on the Northeast Corridor, Amtrak commissioned ENSCO, Inc., to develop a Wayside Train/Track Interaction Detection System. The goal was to measure and collect information on vehicle/track forces that would enable Amtrak to determine the causes of …

Examining wheel/rail interaction on rail transit systems

January 3, 2014 | Filed under: Friction Management, Gary Wolf, Noise and Vibration, Rail Grinding, Rail Transit, Wheel Maintenance, Wheel/Rail Interaction

By Bob Tuzik • November 4, 2004 If the first unwritten rule in optimizing the wheel/rail interface on rail transit is: Know your system; the second rule should be: Recognize that the w/r interface is a system. “No single department can attack the issues in isolation and expect to get very far,” Joseph Oriolo, Senior …

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