This is a theoretical work on lateral creepage, εy for both tangent and curved track. From the equation of motion on tangent track, the expression for the maximum lateral velocity is obtained and then followed by the basic definition of lateral creepage to obtain the maximum lateral creepage. For tangent track the maximum lateral creepage is given by:  
in which,

y0 is wheel clearance, γ is conicity, r is nominal wheel radius, s is the track width, RK is the Klingel radius.

Lateral creepage for a curve is expressed by replacing the Klingel radius with the radius of curve, R as shown below:  

A lateral slip in the running surface exists because of the wheel’s attack angle, which causes the flange to push against the inside of the railhead; consequently, a lateral slip force will be developed [1]. Clearly, this situation provides valid grounds to find a correlation between lateral creepage and the angle of attack. Exactly this is given below.

For curved track:  
in which,

B is wheel base, R is radius of curve.

This equation is suggested for the lateral creepage on the curve, as it contains both components of the angle of attack that connects all important parameters, such as radius, wheel base and wheel clearance.

A threshold creepage value of 0.0045 is suggested. It is shown that a curve with a radius greater than 300 m should not produce wheel squeal noise.

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