This paper discusses test results obtained on a single contact, cylindrical, traction test machine operating at rolling speeds ranging from 5,000 fpm to 25,000 fpm and at maximum Hertz stresses from nearly zero to 200,000 psi. Effects of speed, load and contact length on traction and relative creep between two plain cylinders lubricated with a naphthenic mineral oil were investigated. Test results indicate that coefficient of traction and creep were greatly affected by all three variables tested.