Ten years ago, the authors presented ASME Paper 71-WA/RT-9 which examined air brake system operating and test procedures and their effect on train operation. To meet the requirements of the ’80s, the authors believe it is essential to look back over the last ten years at the factors which influenced the thinking, maintenance trends, and performance of the freight car fleet. To meet future demands, a projection of the car fleet and the tonnage to be carried must be reviewed. Important changes and improvements have been put into place regarding air brake equipment and train speed control. This paper reviews the present situation and looks into the ’90s to identify areas where further changes and improvements seem necessary.

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