Track center ruler

The present invention provides an apparatus of the track centerline position can directly reflect. Middle rail foot, comprising a cross member, wherein: the horizontal axis is provided with a left and right horizontal axis, the horizontal axis left and right horizontal axis are completely symmetrical and of equal length, the middle of the beam is attached to the cross shaft, the cross shaft on the beam secured together by a horizontal axis and a vertical axis composed of the vertical axis passing through a cone portion, said central vertical axis is provided with a lower portion of the prism holder, the prism base prism placed ball, said ball prism cone located on the central axis, the horizontal axis of the left and right end of the horizontal axis in contact with the rail, and the other end in contact with the cone. The present invention uses a simple mechanical device, cleverly reflects the neutral point of the track, to on-site construction and maintenance of a great convenience.