TM 55-203
(2) Lower the car body, with this equipment
(8) Move car to final assembly position. Remove
installed, from the trestles onto service trucks and roll to
the service trucks and apply the repair trucks. After car
the next position to be riveted.
body is lowered on trucks, connect the brake rigging and
(3) Apply the following parts to the riveted
required locknuts. Gage the car for proper coupler
construction: inside hopper sheets, inside hopper sheet
height, check side bearing clearances and test
angles, side sheet gusset plates, cross-bridge sheet,
airbrakes. Car is then ready for painting.
cross-bridge braces, hinge butts, and drop doors.
(4) Move car to floor construction position
9-28. Minor Repairs
and apply the following parts: floor strut angles, long
hood, outside hopper sheet, angles, and the lower floor
Because of the basic similarities of hopper cars and
angles.
gondolas, the procedures outlined in paragraph 9-25c
governing light repairs to gondolas are also applicable to
(5) Move car into position for riveting these
hopper cars. Drop doors and drop-drop operating
members To facilitate work underneath the car, it should
mechanisms are also quite similar on gondolas and
be raised from the service trucks, blocked at the draft
hoppers and the same repair procedures will apply. The
sills, and lowered to rest on them.
sides of hopper cars, near the bottom, have a tendency
to rust out prematurely from rain, melted snow, etc.,
(6) Upon completion of riveting, retruck the
seeping through the sand, coal, or other bulk cargoes
car and move to next position for application of ends
they usually are loaded with. Often such a car cannot
and sides. Then apply following parts: corner caps, side
be shopped and a temporary repair is required. This
sheet ties, tie reinforcements, center floor plate fillers,
can be accomplished by affixing repair sheets to the
draft and end sill gusset plates, and diagonal struts.
inside of the car of adequate size to cover the damaged
area. Replacement plates should be bolted or welded in
(7) Move to next position for riveting of
position as deteriorated side sheets will rarely withstand
these parts and the application of safety appliances.
riveting. Repaired areas should be painted to retard
These include inside steps, brake mast supports, brake
further corrosion.
mast rests, sill steps, grab irons, and ladders.
Section VI. DUMPCARS
which are riveted to the center sill under the car body,
9-29. General
rock on the pedestal castings, which are riveted to the
center sill. Vertical dump cylinders on each side of the
An air dumpcar is an all-metal car so constructed that its
car perform the dumping and righting of the car body.
contents may be discharged to either side or both sides
The body is supported in such a manner that all
of the track through doors in the car sides or drop doors
members between it and the underframe are in
in the floor; by means of an inclined floor and side
compression, with the result that the shock of loading is
doors; or by tipping the car body sidewise by means of
carried directly through the truck spring to the roadbed
compressed air secured from the trainline. Dumpcars
Air dumpcars are provided with air storage reservoirs
are used to move large quantities of earth in excavation
located on the car and charged through the trainline
and construction work along rail lines. It is used for
from the locomotive. Dumping of air dumpcars usually
ditching, trestle filling, coal handling, and emergency
is accomplished by turning the handle of a control valve
work occasioned by landslides or washouts.
The
located on the platform of the car. This charges or
majority of side dumpcars are provided with sides that
exhausts the operating (air) line. The locks are operated
turn down and out coincident with the tilting of the body.
by a separate air cylinder connected to the operating
As the entire side of the car turns down, it forms a chute
line through a cutout cock. Closing the cutout cock
over which the load in the car is discharged (fig 9-4).
leading to any latch cylinder cuts out the dumping
operation of the particular car. The dump body is tilted
9-30. Operation
by the dump cylinders (as shown in figure 9-4) one of
which is mounted on each end of the body. On some
The dumpcar body is mounted on a steel underframe,
cars the same pair of cylinders is used to tilt the body in
pivoted longitudinally over the center sill so as to
either direction, reversal of dumping being accom
discharge on either side. When dumping, the hinges,
9-12
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