Signal Indication into Branches Governed by TT/TO and MBS Rules...?

[NW Mailing List]

Trains moved onto the Abingdon Branch; as I recall, it was under a 
"restricting" aspect.

EdKing

-----Original Message----- 
From: NW Mailing List
Sent: Thursday, April 07, 2016 12:43 PM
To: N&W Mailing List
Subject: Signal Indication into Branches Governed by TT/TO and MBS Rules...?

Does anyone know of a situation where the N&W used a Position Light Signal 
to govern movements entering unsignaled territory operated by Time Table + 
Train Orders under Manual Block Rules?  (The key here is that the track 
being entered had to be governed by Manual Block rules.)

Surely there must have been branches on the Pocahontas Division where a 
"dark territory" branch, operated under TT/TO + MBS Rules, left a main track 
at an interlocking, and this situation would have obtained.

I would be curious to know what signal aspect was used on such a signal to 
indicate the condition of the Manual Block ahead.

At least one other railroad which used Position Light Signals had a unique 
arrangement for this function. For "Clear Block" they used a regular "Clear" 
aspect in the top arm of the signal, over a "marker light" further down the 
signal mast. For "Permissive Block" they used a "backwards" Approach aspect 
in the top arm, over the same marker light further down the mast. The marker 
light was the tip-off that the signal was a Manual Block signal. `This may 
be a clue as to how the N&W handled the situation, although there were no 
such aspects in the N&W Rule Books.

Isn't it a shame we do not have a set of Standard Plans for the N&W Signal 
Department (... if, indeed, such a document ever existed) ?

-- abram burnett

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