NW-Mailing-List Digest, Vol 99, Issue 43

[NW Mailing List]

On 9/17/2013 10:24 PM, NW Mailing List wrote:

> The issue was whether that lower red should be on or off,

> in the case as the turnout it would be on because its an interlocking 

> signal.

Lynn,
     Let me try one more time.
A control point signal can /_only_/ display five different aspects in 
combination with two horizontal red lights which are:
1.) Diverging Clear - two vertical yellow lights below
2.) Diverging Approach - two diagonal yellow lights at a 45 degree angle
3.) Diverging approach diverging - two flashing diagonal yellow lights 
at a 45 degree angle
4.) Restricting - two diagonal yellow lights at a 315 degree angle
5.) Stop - one red light below

In case #1, 2 ,3 & 4, if/*_both_*/ bottom lights burn out or are 
obscured from vision, the signal aspect is to be considered as STOP, 
regardless of what the previous signal aspect displayed. This is a 
SAFETY precaution because you have no idea what aspect is actually 
displayed or meant to be displayed. /For example - maybe you previously 
passed an Approach Diverging signal and are preparing to take the siding 
beyond the next signal. When you get within sight of the next signal, 
instead of having a Diverging Approach aspect, you have only two 
horizontal red lights. You must STOP. Maybe it is just that the yellow 
lights have burned out. Maybe the bottom red light has burned out, and 
after you passed the previous signal, something happened to cause the 
siding to be fouled or maybe a rail broke. You just don't know. You do 
know that you must stop and call the dispatcher for instructions./
In case #1, 2, 3, & 4, if _only one_ of the bottom lights is burned out 
or obscured from vision, you can still determine what the signal aspect 
should be and proceed according to signal indication.
In case #5, if the bottom light is burned out or obscured from vision, 
the aspect is still to be considered as STOP.

Jimmy Lisle
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