CEMP-E
TI 850-02
AFMAN 32-1125(I)
1 MARCH 2000
(5) Track at the ends of open deck bridges should be maintained at the same grade as the track on
the bridge for at least 25 ft beyond bridge abutments and then transitioned smoothly to meet established
track grades.
(6) Track should not be tamped in frozen ballast conditions or if snow cover is present.
g. Switch Stand Installation. The switch stand is normally installed so that when the switch is lined for
the normal (main) route, the connecting rod keeps the point closed with a pulling (rather than a pushing)
force. In most cases, this will mean installing the stand on the diverging side of the turnout. When a
ground throw stand is used, the handle should point toward the frog when the switch is lined for the
normal route.
6. QUALITY CONTROL/QUALITY ASSURANCE
a. Many installations and offices do not have inspectors who are knowledgeable and experienced in
railroad work. In these cases it is strongly recommended that inspection services be obtained from an
engineering firm that specializes in railroad design and construction.
b. As initial work is often covered over in final stages, it is strongly recommended that railroad work be
inspected throughout the process.
c. All relay rail should be ultrasonically tested after installation. Scheduling with a contractor specialized
in this operation should be done well in advance to assure availability at the least cost.
7. AS-BUILT AND FINAL DRAWINGS. Upon completion of construction, a set of red-line drawings
should be given to the installation engineer. Final as-built drawings will be produced showing the actual
track locations, grades, curvatures and complete curve data, rail weight and section, grade crossing
locations and types, crossing signal circuitry and layout, drainage structures, and other aspects of track
construction. These drawings will be given to the installation engineer within 6 months after construction
has been completed.
9-5
Previous Page
