Weight
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. )
Put a "T" for true and an "F" for false.
6.
A spiraled curve is so designed that:
2
a. Its length depends on the superelevation of the circular curve.
2
b. In a theater, a newly constructed railway curve of 2 degrees or less should not include
spirals.
2
c. A short one can be approached safely by a high-speed train.
2
d. The increased superelevation to which the train is subjected per second is considered.
2
e. A curve with the greatest superelevation will need the shortest spiral.
7.
Highway engineers bank a curve to compensate for inertia; railway engineers use
superelevation. Of the following, which is true and which is false of superelevation?
3
a. It is more of a problem on single track than on double track.
3
b. Four inches should be the maximum ever used on a military railroad.
3
c. If the maximum is used and is insufficient for expected speeds, speed limits have to be
increased.
3
d. When a train rounds a curve at the correct speed for the equilibrium superelevation, the
wheels should bear evenly on the high and low rails.
3
e. When the correct speed for the equilibrium superelevation is exceeded, a greater force
bears on the high rail.
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