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Difficulties experienced with overheated bearings (hot boxes) on railroad freight cars are discussed. Research to develop corrective action was undertaken from which the freight car journal lubricator evolved. Service tests of several of the early designs of these lubricators were run to develop the effect of oil level on their performance. These were followed by service tests on 23 different makes of lubricators to develop their relative ability to operate extended mileage between oil additions and to develop their relative oil consumption rates. Data are presented showing the results of these tests. During one series of tests the temperature of the journal box surface was recorded when various journal bearing temperatures existed at various ambient temperatures. Wayside hot-box detectors scan the journal box surface temperature to give a warning of hot boxes. Data are presented showing the relationship between journal box surface temperature, bearing temperature, and ambient temperature.
Pinney, M. A.
Engineer of tests, Pennsylvania R. R. Co., Altoona, Pa.