1 MARCH 2000
(3) If records of an internal rail inspection are more than 3 years old, a new inspection should be
made before the rehabilitation plan is completed.
(4) All turnouts in the track intended for rehabilitation should receive a thorough inspection, including
operating the points.
(1) Railroad rehabilitation plans will include a condition assessment of the bridges on any line to be
rehabilitated. This assessment may come from the last annual inspection, if that inspection is less than 6
months old. Otherwise, a new condition assessment will be done.
(2) If a triennial inspection is due within 6 months for any bridge on a line to be rehabilitated, the
triennial inspection and load rating (per chapter 5, paragraph 4) will be done as part of the rehabilitation
(3) If the last annual inspection indicates any significant change in condition of a main bridge member
since the previous load rating was done, at least the included span (or spans) of the bridge will be
thoroughly inspected and load rated (per chapter 5, paragraph 4) as part of the rehabilitation plan.
d. Terminal and Support Facilities. The condition of all terminal and support facilities should also be
evaluated. This evaluation may be done and reported separately from the track evaluation.
4. STRUCTURAL EVALUATION.
a. To determine current load carrying capacity, a structural evaluation will be performed for all track,
bridges, loading ramps, and other structures needed for railroad and terminal operations.
b. Track structural evaluation should be done using the computer program described in appendix C.
(1) The load-carrying capability of a railroad line is often determined by the design capacity and
present condition of the bridges along the route.
(2) All bridges that have not been thoroughly inspected and load rated within the previous three years
will be examined and rated by a practicing railroad bridge engineer. The rating will be done in
accordance with the AREMA manual for timber bridges, concrete bridges, and steel bridges.
(3) Most military railroad bridges are of conventional timber design, built to an E60 rating. If these
bridges are in very good condition, this capacity is sufficient for typical military traffic levels, including
handling of 140-ton heavy equipment flatcars.
(4) By the AREMA rating guidelines, the in-service rating for bridges in very good condition may
actually exceed their design rating.
(5) Additional material on bridge design ratings is found in chapter 7, paragraph 2.