L/V Forces

The How and Why of L/V-based Thresholds

by Jeff Tuzik The L/V ratio is a ubiquitous measurement in the world of wheel/rail interaction. It is typically combined with the Nadal limit, functioning as shorthand for wheel climb derailment risk for a given set of conditions. But the L/V ratio and the various formulae used to set risk …

Derailment Mitigation at Switches and Turnouts: Three Perspectives

by Jeff Tuzik A lot of derailments happen at switches and turnouts. Many are low-speed, low-energy derailments that happen in yards and sidings. But they’re still costly and disruptive. Evaluating and optimizing wheel/rail contact conditions at these locations is different than it is on open track. It requires specific tools, …