Weight
2
a.
Traffic density.
2
b.
Availability of materials.
2
c.
Maximum track curvature.
2
d.
Depth of subgrade.
2
e.
Height of ties used.
9.
Drainage of the track structure over part of a heavy traffic line is being
hampered by contaminated ballast. The crushed stone ballast was put down 4
years ago. To solve the problem, you would:
2
a.
Remove the dirty ballast, clean and replace it, and add any new amount
needed.
2
b.
Undertake a large-scale program of grouting.
2
c.
Schedule it to be cleaned in 2 years.
2
d.
Clean the ballast by hand or by mechanical ballast cleaners.
2
e.
Remove the dirty ballast and replace it with new, clean ballast.
10.
As a track supervisor, you would expect good ballast to:
2
a.
Hold moisture near crossties.
2
b.
Maintain proper track alinement.
2
c.
Drain the track structure.
2
d.
Maintain correct track gage.
2
e.
Help in maintaining track surface.
11.
As a track supervisor, you decide to use cinders for ballast in a certain yard
because of:
2
a.
Their resistance to being ground into dust.
2
b.
Their economical first cost.
10
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