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Compliance Testing for Locomotive LED Headlights and Auxiliary Lights, Phase IV

Document Series
Technical Reports
Federal Railroad Administration
Report Number
Subject Rolling Stock
Locomotive headlights, auxiliary lights, LED, halogen, Phase IV compliance testing, cold weather performance, environmental testing, Code of Federal Regulations §229.125

This report describes the work performed during Phase IV compliance testing of light-emitting diode (LED) fixtures used as locomotive headlights and auxiliary lights. The purpose was to study the performance of the lamps under severe cold weather conditions. Researchers sought to determine whether LED lamps could melt a 1/4-inch-thick layer of ice from a lens surface and whether the lamps would accumulate a coating of snow and ice when operated in the presence of very cold, windblown snow. Throughout the testing, halogen lamps, currently standard equipment on freight locomotives, were used as a performance benchmark.

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Last updated: Friday, April 9, 2021