Train orders not only authorize a train to run as an extra, but
they also establish meets between opposing extra trains or change a
timetable meet, and they can also give an inferior train right over a
superior train. Figure 2.3 is an example establishing a meet between
two extra trains on the rail division shown in figure 2.2.
Figure 2.3. Train Order No. 2 from Quincy.
When one train has superiority over another, the inferior train
must protect itself from the superior one; it must also clear an
opposing superior train at any station by at least 5 minutes. Assume
that over the same railroad shown in figure 2.2, you want to run an
extra train from Alfa to Delta and give it superiority over a regular
train listed on the timetable to run from Delta to Quincy. You can
issue a train order to both trains, stating that the extra will not
leave Bravo until 0830 hours and will not leave Charlie before 0900
hours. In this instance, the regular train can leave Delta only if
it can be in the siding at Charlie by 0855. If it can get into the
siding at Bravo before 0825, it can continue to Bravo. Without the
train order giving it right over the superior train, the extra train
would have the same restrictions placed upon it. It would then have
to clear the superior train's schedule at each station by at least 5
minutes.
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