TM 5-628/AFR 91-44
(2) Appearance in track. Can be recognized
much farther down the side and/or across the
running surface.
by one or more of the following:
(d) A horizontal hairline crack in the
(a) A dark streak on the running
side of the rail head turning upward or downward
surface.
(b) Widening of the head for the length
at one or both ends usually accompanied by
bleeding. Under such conditions a flat spot will
of the split. The cracked side of the head may show
generally be present on the running surface.
signs of sagging.
(e) A hairline crack extending
(c) Sagging of the head causing a rust
downward at right angles from a horizontal crack
streak to appear on the fillet under the head.
(d) A hairline crack near the middle of
caused by shelling of the upper gage corner of the
rail head (fig B-23).
the rail head.
is apparent on the rail surface and in the fillet under
the head (fig B-24).
aa. Vertical split head.
(1) Description. A progressive longitudinal
fracture in the head of the rail perpendicular to the
running surface.
B-10
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