constructed in four separate sections, two for each side; the ends
are single units; and the roof is one unit.
The door assembly
consists of a door track, threshold plate, and door.
shows the flatcar underframe with boxcar superstructure unassembled,
and figure 2.8 shows the assembled boxcar with the door open.
Underframe With Boxcar Superstructure Units.
Assembled Boxcar With Door Open.
To assemble the car, the underframe is assembled the same as
for the flatcar with the exception of camber adjustment, corner
connection angles, sill steps, and handholds. The two side sections
adjacent to one end of the car are first attached to the underframe;
then the end unit connecting those two side sections is attached to
them and the end sill of the underframe.
The same procedure is
followed for the other end of the car.
When the side sections and
end units are erected and the door tracks and doors are in their