Figure 1.10. Typical Clearances.
56 1/2 inches, but it is widened on sharp curves and sometimes made narrower on high-
speed lines. Cross level refers to the relative height of the two rails; surface refers to their
Rail equipment must conform to certain clearance limitations. Each section of a railroad
has its track-clearance chart or diagram, showing the maximum dimensions of rail equipment
and load that can pass over the line. Maintenance personnel must observe the clearance
limitations also, especially when raising track level in tunnels or if changing alinement when
structures or walls are nearby.