TM 5-628/AFR 91-44
(a) A bulging of the web on either or
split head will appear as a hairline crack in either
both sides. Shallow cracks due to distortion may be
side or both sides of the rail head usually (0.25)
found in the bulging surface.
(b) A slight sinking of the rail head may
inch or more below the top of the rail head (fig B-
exist above the pipe (figs B-16 and B-17).
q. Mill defects.
(1) Description. Deformations, cavities,
seams, or foreign material found in the head, web,
or base or the rail. Mill defects are not critical
(2) Appearance in track. Any deformation
in the rail, broken out area, or inclusion (fig B15).
r. Piped rail.
(1) Description. A progressive longitudinal
s. Rail wear.
fracture in the web of the rail with a vertical sepa-
(1) Description. The loss of material from
ration or seam, forming a cavity in the advanced
states of development.
the running surface and side of the rail head due to
(2) Appearance in track.
the passage of wheels over the rail.