for one day and an extra train authorized to run instead, this change
to the timetable is made by train order. If there are many permanent
changes, a new timetable is usually issued.
2.10. TIMETABLE RULES
The rules discussed in this paragraph are taken from the
technical manual on railway operating rules. The numbers correspond
to the rule numbers in TM 55200. Only the rules that directly
pertain to the timetable and its application are included; this
accounts for the seemingly odd appearance of the secondorder
a. Rule 4. Timetable.
(1) Each timetable, from the moment it takes effect, supersedes
the previous timetable. All trains operating on schedules
not provided for in the new timetable will secure valid
authorization from the dispatcher to continue their runs
and do so as extra trains.
(2) Schedules on each division or subdivision date from their
initial stations on such division or subdivision.
(3) Not more than one schedule of the same number and day shall
be in effect on any division or subdivision.
(4) Notice of a new timetable or supplement will be bulletined
at least 24 hours before the time it is to take effect.
During a period commencing at least 24 hours before and
continuing until 6 days after a new timetable or supplement
becomes effective, notice by train order must be delivered
to all trains at their initial stations.
(5) Receipts of a new timetable or supplement must be secured
from all personnel in train, engine, or yard service.
(6) Bulletin boards or books will be provided at stations
designated by timetable. Timetable bulletins will contain
only information or instructions relating to the rules or
the movement of trains. They supersede special
instructions in the timetable or any rule or regulations in
this manual with which they conflict.