Profiled rail for use in railway line - consists of normal head and foot joined by web but with recess centrally in underside of foot filled with lead

摘要

A recess (5) runs the full length of the rail and is filled with a metal with a low module of elasticity, such as lead (6). Alternatively there are projecting ribs on the side of the web to form a recess for the lead, or again a channel may be attached to the web for that purpose. The recess is closed by a cover (7), which is secured either by deforming the steel or by welding. The lead filling absorbs the sound energy from the wheels of fast moving trains and converts it into heat and the thermal emission is considerably reduced. ADVANTAGE - Cost of noise reduction is considerably less than the conventional.