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In order to extend the service life of electric machines traction rolling stock has been proposed recovery technology insulation using infrared energy, will improve the quality of insulation in terms of the breakdown voltage and hardness. This article analyzes and estimated of experimental studies conducted in two different meaningful of the work in this direction. Presents an analysis these works in terms of distinctive features and conclusions of the pilot studies. According to the analysis formulated a new hypothesis about the need to address when capsulating the insulation and its elasticity. Also set new directions for future research.