B. For trains passing.
C. Reversing rights of trains.
D. Movements regulated by time.
E. For running in sections.
F. For extra trains.
G. For annulling trains.
H. For annulling an order.
I. Holding orders.
Practice may suggest additional forms or combinations of these.
In these forms trains are designated by numbers, it being understood that those of odd numbers move in one direction and have the right of track as against opposing trains of even numbers, and that the train rules fix this as well as which train shall ordinarily take the siding.