As part of the Association of American Railroads’ (AAR) Strategic Research Initiative (SRI) program, MxV Rail (formerly TTCI) conducted simulations to evaluate the effects of track conditions on vehicle hunting performance. The results indicate consistent track conditions in the vicinity of truck hunting detectors (THD) would produce more consistent hunting measurements. The widely accepted understanding of hunting places a strong focus on the wheel-rail interface.1 Quantified by the lateral acceleration of the carbody in testing and simulation and by the proprietary Hunting Index (HI) in revenue service, hunting is the lateral oscillation of the conical wheelset on the track as the wheelset attempts to maintain its center around the points of equal rolling radii. Excessive hunting is identified by high lateral accelerations of an on-track vehicle or a high HI from a THD that could cause damage to the lading, the vehicle, the track structure, and in extreme cases, could…