Based on a lot of related documents, in this article, the hard and soft system of a new style of E-Class rail foot flatness measuring instrument was designed and made.

Measurement of the flatness of rail hand been finished by the rail foot flatness measuring instrument, it shows that the device designed can achieve the measure of Smoothness of welded joints.

This woman loves maps so much -- and the CTA -- that she has the rail system map tattooed on top of her foot.