Solid lubricants are used for wheel flanges of trains which contact rails, other machines that have wheel and rail and also in applications that is necessary to reduce local friction in contact areas between two metals. Using solid lubricants in wheel flange-rail gauge corner contact, especially in railroad curves significantly reduces wear and in addition increases wheel and rail life and also reduces risk of derailment. Due to non-fluidic and non-spreading features of solid lubricants, as compared with fluid lubricants, such as oil and grease, they have obtained priority and increasing applications day by day. Due to availability of a wide range of solid lubricants and their different applications in various rail road conditions, knowing their essential features and characteristics and their methods of testing and examination, helps us to choose them properly and causes optimized lubrication conditions where they are used. For these reasons it was decided to investigate on various features of solid lubricants and compare two types of solid lubricants, one made in Iran called Lubrisol and another one called LCF, made by LB Foster. The above mentioned solid lubricants were compared based on tests suggested by DIN EN 16028 standard. Performed tests were: friction test, hardness test, Thermal Gravimetric Analysis (TGA), density test, flame retardancy, water absorption and Scanning Electron Microscope (SEM) test. Pin-on-disc test was performed instead of twin-disc test by making a novel mechanism to apply solid lubricant on the rotating disc in order to establish friction conditions similar to real conditions. According to DIN EN 16028 standard, melting point test has been specified to evaluate thermal properties of solid lubricants, but this test is inapplicable for solid lubricants made by thermosetting polymers and Thermal Gravimetric Analysis (TGA) was used instead. By comparing LCF and Lubrisol solid lubricants it was concluded that both parts had similar lubrication properties and thermal stability in the operating temperature ranges. Hardness and density of Lubrisol was less than LCF by about 10% and its water absorption was 10 times more than LCF part; however, it was about 1% which is negligible and acceptable; because test condition is much more severe than real condition. Keywords: Solid Lubricants, Train Wheel Flange, Rail Gauge Corner, Wear, Tribology, Pin-on-Disc Test