What is the gap under each end of the magnetic straight edge for a properly crowned 136 lb rail?

For a properly crowned 136 lb rail, the gap under each end of the magnetic straight edge is designed to ensure proper alignment and support of the rail. The specified gap helps in maintaining an adequate crowning, which is essential for track stability and effective weight distribution.

A gap of .070 - .075 inches is ideal because it allows for slight variations in track geometry while ensuring that the rail is not overly bent or twisted. This range also supports the natural thermal expansion and contraction of the rail material, promoting longevity and reducing maintenance frequency.

Choosing this gap reflects industry standards for rail installation, where precise measurements are crucial to prevent issues that can arise from improper crowning, such as uneven wear or instability in the rail system. Maintaining this specific gap facilitates proper alignment and optimal functioning of the rail in relation to the magnetic straight edge.