Weight
3
5.
When vitrified sewer pipe is used to drain a side ditch, the pipe joints are
closed tightly to prevent dirt from entering and clogging the pipe.
Cluster True-False
(Each question of this kind consists of a series of statements related to the
stem that precedes them. Indicate which are true and which false with respect
to the stem.)
6.
Water pockets are a great nuisance to the track maintenance crew. They are
often:
2
a.
Created by operating numerous heavy trains over poor quality ballast.
2
b.
Caused by pumping ties.
2
c.
The cause of heaving roadbed.
2
d.
The result of soil erosion.
2
e.
Caused by porous material surrounded by impenetrable material.
7.
A good roadbed is essential to a railroad because it:
2
a.
Receives train weight from ballast above and transmits it to ground
below.
2
b.
Compensates for irregularities of terrain.
2
c.
Supports ballast above adjacent ground to provide run-off for water.
2
d.
Provides the stability that a track needs.
2
e.
Should be spongy to reduce shock to rails and provide a comfortable
ride.
8.
As a track supervisor in an oversea area, you would select new ballast on the
basis of the:
9
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