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A pin and disc machine has been modified for the evaluation of silver-steel lubrication characteristics of railroad diesel oils. Use of silver pins on polished steel discs at selected loads and rubbing speeds allows good correlation with known engine behavior. In comparison with wear and friction data obtained by the four ball method, this pin and disc test gives better correlation with engine tests than the Modified Four Ball Test.

By proper choice of operating conditions, an oxygen absorption test can be used to predict the oxidation stability of railroad oils in high severity diesel engines. This paper describes a modified oxygen absorption apparatus and the conditions chosen for testing railroad oils, and discusses the effects of soluble metal catalysts, the correlation between volume of O2 absorbed and various properties of used railroad oils, and correlation with engine tests. This test is also used to determine the effects of railroad oil additives and base oils on the oxidation stability of the lubricant. It involves circulation of oxygen through the oil at a controlled temperature and flow rate, in the presence of soluble metal catalysts, until a definite quantity of O2 has been consumed. The rate of O2 consumption is constantly monitored by a transducer.