Numbers
19 & 31 Train Orders	These types of orders were transmitted to train crews. They covered vast area of conditions such as fixing meeting points, speed restrictions.
19 Order	Train order that does not have to be signed for. Operator can hand it on a hoop or delivery fork as the train slows down. (See 31 order.)
31 Order	Train order that must be signed for; the train must stop to pick it up. (See 19 order.)
99	Failure to protect your train or to flag it. Referring to Rule 99 in the Book of Rules.