It is all too common on railway track to find isolated sections .... er and up to the edge of the two adjacent sleepers; .... there were 5 mm thick rubber rail pads whereas in ..... Therefore, for the isolated section of track the time ..... Y(E) = (A.; PH({ â Å i) + 4,; Yo + Az, YA ... inertia, and whose support has dynamic stiffness k* is. 9/2.