Since the rule specifies both arriving and leaving time, it follows
that a train due to arrive at a station at 0700 and depart at 0707 could
continue on its schedule if it could arrive exactly at 1900 and depart
exactly at 1907. If, however, it arrived at 1901, it would then lose its
schedule, and it would have no right to leave even if it could complete its
unloading aid loading and be ready to depart by 1906.
Conversely, if it
arrived before 1900 and couldn't depart until 1909, it would likewise die on
its schedule. In the first instance, it would be because of late arrival
and in the latter because of late departure.
In either event, the
dispatcher would have to recreate the train as an extra, or run it as a
section of another scheduled train, as explained in paragraph 4.7. If the
schedule of no other train were convenient, the dispatcher could create the
train as an extra and, because it was so long overdue, probably confer on it
right over all other trains until its destination was reached, or until a
division terminal was reached and another dispatcher had jurisdiction. Loss
of schedule is not a common occurrence because most dispatchers take some
positive action to assist a train or annul its schedule before it becomes 12
hours late. However, this is not always possible.
b. Change of timetable. A train may possibly lose its schedule because
a new timetable is issued. Assume that a first-class train operates daily
to and from a summer resort from 1 June through 30 September. Because the
train operates exclusively for the convenience of the resort patrons, it is
annulled effective the first day of October. Therefore, at midnight on the
last day of September a new timetable takes effect. Since the train is due
to arrive at its home terminal at 2330 hours, the new timetable has no
effect on the train if it completes its last return run on schedule.
Suppose, however, on the last return trip, the train is an hour late
leaving the resort station and the dispatcher "puts out" an hour on the
train, as explained in paragraph 4.10a. At midnight--technically at 0001--
the train loses its schedule and its right to be occupying the main track
because its schedule does not appear in the new, and now current, timetable.
The hour's time that the dispatcher has put out on the train cannot be
carried over to the new timetable.
Therefore, when the train's schedule
expires at 0001, it would have to be handled exactly like the train
discussed in subparagraph a.
Under the conditions outlined in the example just given, the
dispatcher takes different action. When he sees that the train is an hour
late leaving its initial station and is going to overlap a new timetable, he
annuls the train's schedule. He then creates it as an extra and gives it
right over all trains to its destination.