(2) Right is superior to class or direction.
(3) Direction is superior between trains of the same class.
b. Rule D71. General. A train is sup;. or to another train by
right or class.
(1) Right is conferred by train order; class by timetable.
(2) Right is superior to class.
c. Rule 72. Class and Direction. Trains of the first class are
superior to those of the second; trains of the second class are
superior to those of the third; and so on. Trains in the direction
specified by the timetable are superior to trains of the same class
in the opposite direction.
d. Rule 73. Extra Trains. Extra trains are inferior to regular
1.7. EXAMPLES OF TRAIN SUPERIORITY
The following examples explain how train superiority by class or
direction is established by the timetable, and illustrate how right
can be conferred on any train. For our purposes, assume that the
railroad shown in figure 1.1 is a singletrack, standardgage
division in a theater of operations extending from a port to a
railhead (RH) through stations A, B, C, and D. The only sidings on
the division are located at these stations. The timetable for this
division has two classes of regular trains scheduled, and the
superior direction is east from the port to the railhead. The three
hypothetical operations presented in this figure are separate
situations happening at three different times. They could not happen