proper place, the roof is positioned and secured to the corners and
sides.
2.14.
TANK CAR
A tank car consists of a tank, usually made of steel, mounted
on a car with a special underframe.
Except for its superstructure
and a modified underframe, the tank car has components similar to
other cars.
The underframe is floored and steel running boards are
built on each side at a height even with the flooring.
Made of a
corrosion-resistant material, tank shells may have either a single
compartment or multiple ones.
The ordinary tank car has a single
compartment equipped with dome safety valves and bottom outlets.
To prevent corrosion, linings are required in steel tanks when
acids are shipped in them. Some may be insulated to provide the even
temperature required by certain commodities. In addition, some cars
may have steam coils installed inside the tank shell to provide heat
for lading.
Tank cars are used for transporting liquid and
semiliquid commodities such as oils, gasoline, alcohols, acids, coal-
tar products, compressed gases, fruit juices, and milk.
Tank
capacities usually range from 5,000 to 10,000 gallons.
A typical
U.S. Army tank car is shown in figure 2.9.
Figure 2.9.
Typical U.S. Army Tank Car.
Tank
cars
in
the
foreign
service
fleet
have
single
compartments and would normally carry petroleum products. The 5,000-
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