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Ellcon Models 6600-IU (60 percent proportioning) and 6600-IU/50 (50 percent proportioning) empty/load device sense only one truck to determine whether to proportion the brake cylinder in the loaded or empty mode. This body mounted unitized model made of lightweight aluminum combines the air reservoir, proportional valve and sensor valve in one compact package. It is interchangeable with downstream units located at intermediate trucks of 125-ton articulated five-unit double-stack cars.