signaling (was signal brackets)

[NW Mailing List]

Mike,
     Stop and Proceed/Restricting signals are intermediate signals which 
are not controlled directly by the dispatcher. Their aspect follows the 
CTC system protocol automatically according to block occupancy, a track 
defect (such as a broken rail) or a "Current of Traffic" set up by the 
dispatcher at a control point. Stop signals are "Control Points" 
operated by the dispatcher.
     The center lights were removed when the signal system was changed 
from "Position Light" (PL) to Color Position Light (CPL). The center 
light was not needed. The only indication that a light is burnt out is 
by someone physically reporting it. The dispatcher has */_absolutely no 
idea_/* what aspect is displayed out in the field. That is why you will 
never hear the dispatcher tell a crew to "Take the green" despite what 
Lionel and MTH would have you believe!!! The dispatcher will only tell 
you "Signal indication".

Jimmy Lisle

On 3/29/2024 9:17 AM, NW Mailing List wrote:
> Thank you Jim.
> A couple questions from even this "Intro to Signals 050" class
>
> Why STOP AND PROCEED and not simply STOP?
> Is this because the train has authority and/or there is no oncoming 
> train in front of it?
>
> Why were the center lights removed from the earlier position lights? 
> Simply cost savings? It seems like a 3rd light is one extra protection 
> if one of the others burn out. For that matter (extremely sorry for 
> the tangent), is there some electrical indication that a signal light 
> is burned out that is displayed in an operations office, or was it 
> simply reported by crews?
>
> Mike Rector
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