Rail noise, especially the dreaded curve squealing, is caused by transverse forces which pull the vehicle outwards and at the same time tracking forces are created on the wheel flange which hold the vehicle on the curve. These forces give rise to very small slipping movements of the wheels in lateral direction, which with the material pairing of metal on metal can lead to high frequency squealing noise. Longitudinal slip can also cause squealing or creaking noise.

Traffic operators are faced with the task of dealing with complaints from local residents about noise and local authority regulations on noise emissions, particularly in curves and at turning points.

Traditional solutions often focus on complex, blanket constructive measures, while a simple but effective method is often overlooked: treatment of the rail surface with suitable rail head treatment products to optimize the coefficient of friction.

LOCOLUB ECO PLUS and GLEITMO RFL ECO are two innovative top of rail friction modifiers designed to reduce noise in curves, in addition to lubricating the rail flanks. The use of these lubricants with a relatively high content of special solids and proven adhesion creates a fine film of solids. The result is minimal reduction from the friction between wheel and rail, without removing the frictional connection.