Twentieth century manual of railway and commercial telegraphy by Meyer Frederic Louis 1875-

Author:Meyer, Frederic Louis, 1875- [from old catalog]
Language: eng
Format: epub
Tags: Telegraph
Publisher: Chicago and New York, Rand, McNally & company
Published: 1902-03-25T05:00:00+00:00

Go Ahead. (Single Track.)

Go Ahead. (Double Track.)

Stop. (Single Track.)

Stop. (Double Track.)

PART VI.

LESSON I.

Block Signaling.

Definitions.

Absolute Block — A railway supposed to be divided into certain sections of a given length termed blocks. No two trains or engines, except double-headers, are allowed, or are supposed to be allowed, to enter any one section at the same time.

Permissive Block — Under certain circumstances, or by authority of the dispatcher, more than one train or engine is permitted to occupy a block at the same time, providing each train is notified whether the block is occupied or not, by the use of a CAUTION CARD, or second part of a RELEASE, where they meet at an intermediate siding or non-telegraph office.

Manual Block System — This applies where the signals are operated manually, and by its construction requiring the co-operation of the signalmen at both ends of the block to display signals.

Distinct Circuit —Where the system requires a distinct circuit from station to station, and the constant attention of operators to their respective duties.

(139)

General Explanation of Block Signals.

The signals generally used are of the semaphore pattern, which consists of a post and arm, pointing to the right for all trains whose movements it governs. The position of the arm, or the color of the light displayed, indicate CAUTION, DANGER, or SAFETY.

The block signals are also used for train orders, and all rules applying to train orders.

Bed

Is an indication that the block is NOT CLEAR, and signifies STOP.

The HORIZONTAL position of the semaphore arm is the equivalent of " Stop."

The DIAGONAL position is the equivalent of "Proceed."

In blocking trains ten minutes apart the following rules will be observed: (A) As soon as the rear car, carrying markers, passes your signals, display signals at "danger" position, keeping them in that position until ten minutes have elapsed. No exception to this rule will be allowed unless authority for the same is received from the dispatcher. (B) The train dispatcher may authorize an operator to allow a train to follow another in less than ten minutes, by the use of the CAUTION CARD, in which event he will send an order of the following form :

Signalman at

Issue card No -to No

OK time M

Train Dispatcher.

(C) The only exception allowed train dispatchers, as per example (B), is when a train requires the assistance of a following train, or when trains close up at meeting or passing points, and then only when weather and grade conditions are favorable. In the latter case no exception will be made in allowing any train to follow a passenger train.

Block signals are used to control the movement of trains upon the main track, and must NOT be accepted by trains on sidetracks.

Proper authority must be obtained from signalmen before proceeding, by trains arriving at a block station where signal is at "Stop," by trains occupying sidetracks, or by trains starting from terminal stations,

" Proper authority " consists of:

(A) A Caution Card and Release.

(B) A Release stamped " BLOCK is CLEAR."

(C) A Train Order stamped "BLOCK is CLEAR.

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