c. Double-track train sheet. Annex C shows a train sheet as it might
be maintained for the double-track division illustrated in figure 1.4. The
method of compiling the sheet is identical with that of the single-track
sheet. Outwardly, the sheets are the same; however, one difference can be
noticed upon close examination. When two trains in opposing directions pass
a given point, no delay is shown for either train.
On double track,
movements are separated and cannot interfere with each other. In contrast,
note the time entries at RK tower in columns 1 and 2 on annex B when trains
met on single track.
d. Weather entries.
In addition to the train entries, the weather
columns are also important.
Every 6 hours the dispatcher receives from
various stations along the line a report on the weather at the reporting
office. These weather columns, in the lower right of the train sheet, are
more than routine. Knowledge of the weather along the line may well enter
into the dispatcher's planning. A sudden drop in temperature 75 kilometers
away might require that tonnage be reduced on future trains. Heavy snow,
wind, and sleet storms, as well as torrential rains that may cause flood
threats, must be reported and recorded so that the dispatcher may use this
information in his planning. Knowing exactly what the weather is at various
points on the line enables the dispatcher to issue reduce-speed orders if
necessary, or provide engine pusher assistance at points where trains may be
stalling on wet or ice-covered rails. Any other unusual occurrences during
the dispatcher's tour of duty, which might be useful as a matter of
permanent record, should be entered on the reverse side of the train sheet.
HANDLING EXTRA TRAINS
Chapter 1 shows how a dispatcher may create an extra train and permit it
out on the main line to run with respect to the timetable.
train sheet serves as a quick, visual aid for the dispatcher to fix meeting
points for extra trains, the method of handling extras is recounted in some
detail at this point in the text.
If extras on single track ran in one
direction only and regular trains were always on time, train orders would
seldom be required.
However, extras must be operated in both directions,
and the dispatcher's orders are the only means of notifying crews of the
presence of opposing extras. Additionally, when scheduled trains run behind
schedule, as so frequently happens, operations on the division are
disrupted. Then the orders are used to lessen delay to other trains and to
assist late trains in getting back on schedule. The following subparagraphs
describe some of the tasks involved in operating extra trains.