The railway diesel crankcase lubricant composition 1, wherein said pentamethylenehexaamine is substituted with a N alkyl alkylene diamine having the formula ##STR13## wherein R is hydrogen or a hydrocarbon group and R3, R4, and R5 each are hydrogen or a hydrocarbon group, and {HEAD ~ a} is {TAIL ~ an integer} between 0 and 7 
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The railway diesel crankcase lubricant composition 1 , wherein said pentamethylenehexaamine is substituted with a N alkyl alkylene diamine having the formula # # STR13 # # wherein R is hydrogen or a hydrocarbon group and R3 , R4 , and R5 each are hydrogen or a hydrocarbon group , and { HEAD ~ a } is { TAIL ~ an integer } between 0 and 7
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