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Re: Question about semaphores

February 17, 2017 03:36AM
Hi Chris,

I notice the lower semaphore has a middle position, not just on-off.

Having worked in electronics test engineering for 25 years, I understand fail safe very well. I'd forgotten the pivot point on the two types of semaphores were in different positions.

Another interesting thing about the PRR was their 3 position all white signals to sort of duplicate the semaphore. The PRR was the self proclaimed Standard Railroad of the World even though did do odd things quite often such as Belpaire fireboxes and the 3 position all white signals and their experimenting with Duplexes and rejection of the Articulateds.

Thanks for sharing your photos. They are very interesting.

Doug vV

--------------------------
Carrie Fisher quotes:

Instant gratification takes too long.

Resentment is like drinking poison and waiting for the other person to die.

I was street smart, but unfortunately the street was Rodeo Drive.



Edited 1 time(s). Last edit at 02/17/2017 03:40AM by dougvv.
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Question about semaphores

John Cole February 16, 2017 08:38PM

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bcp February 16, 2017 08:51PM

Re: Question about semaphores

dougvv February 16, 2017 10:42PM

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Etrump February 16, 2017 10:50PM

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dougvv February 16, 2017 11:10PM

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dougvv February 17, 2017 12:43AM

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Chris Walker February 17, 2017 02:42AM

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dougvv February 17, 2017 03:36AM

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T A Hunter February 17, 2017 11:35AM

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WilliamDiehl February 17, 2017 03:59PM

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ND Holmes February 17, 2017 05:05PM

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Brian Norden February 17, 2017 06:39PM

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Chris Walker February 17, 2017 01:15PM

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dougvv February 17, 2017 01:23PM

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Chris Walker February 17, 2017 01:29PM

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dougvv February 17, 2017 01:31PM

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Brent February 17, 2017 10:30AM

Re: Question about semaphores

John Cole February 17, 2017 05:20PM

more info on semaphores - PRR SG if you are interested.

dougvv February 17, 2017 04:45PM

Re: more info on semaphores - PRR SG

dougvv February 17, 2017 10:41PM

Re: more info on semaphores - PRR SG

Chris Walker February 17, 2017 11:21PM

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Brian Norden February 17, 2017 06:54PM

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Brent February 17, 2017 07:06PM

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Chris Walker February 17, 2017 08:22PM

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Earl February 17, 2017 08:14PM

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Jim McKee February 18, 2017 11:16AM



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