Form S-H

5.18.

FORM S-H

The form S-H train order pertains to an extra work train on single

track. It authorizes the train to occupy the main track and do right-of-way

work in the area designated and between the hours specified. The working

limits or time limits of a work extra cannot be extended by superseding the

original order to the work train. If an extension of either or both time

and work limits of the work extra is necessary, the original order must be

annulled and a new order issued.

Copies of this order inform all other

crews traveling in the area of the presence of the work extra and the

flagging instructions it holds, if any. An example follows: "Eng 5440 Works

Extra 0930 Hours Until 1701 Hours Between MD and RK."

In this order, no flagging instructions are specified. Basically, all

work extras are required to protect, that is, flag, against all other extras

and, of course, against all other trains of superior class.

Because this

order specifies nothing to the contrary, everybody reading it knows that the

work extra is to protect itself against all movements in both directions.

This order, however, may be amended to read: "Eng 5440 Works Extra 0930

Hours Until 1701 Hours Between MD and RK Not Protecting Against Westward

Extra Trains."

Or, "...Not Protecting Against Extra Trains."

The

designated area can be stated as between kilometer posts instead of between

stations. Paragraph 5.19 explains this more fully.

Work extras must, unless otherwise instructed, protect against extra

trains in both directions. Therefore, it is improper to tell a work extra

to protect against an extra until after it has been told not to protect.

Occasionally, it might be necessary to make a work extra superior to all

trains. This might occur when a wreck train is called to an accident scene.

If so, the following order might be typical: "Work Extra 9510 Has Right Over

All Trains Between DN Tower And BL From 1330 Until 1830 Hours."

5.19.

FORM D-H

The form D-H train order is used for work extras on double track or on

two or more tracks, as well as specifying the track or tracks the work train

is to occupy. The rules provide that the working limits should be as short

as possible. In the few books published on dispatching, examples show the

working limits as the areas between two or more adjoining stations, as the

examples in subparagraphs a through c specify. In actual rail operations,

however, the working limits may frequently be only 2 or 3 kilometers long.

Where the working area is comparatively short, kilometer posts instead of

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