• Question about Signaling

  • General discussion about railroad operations, related facilities, maps, and other resources.
General discussion about railroad operations, related facilities, maps, and other resources.

Moderator: Robert Paniagua

  by l008com
 
As most people know, as a train passes a green signal, that signal turns red. I have a very specific question about that. Are there rules dictating how far away from the border of the signal block, the signal itself has to be? In other words, if the border between two signal blocks is here:
==========|============
... how far away does the signal have to be? Is that location dictated by rules? Is with within inches of the divide? Feet? Yards? Can the driver see the green light turn red as he's going by?
  by Erie-Lackawanna
 
Since the signal protects the block ahead, it should be located at the insulated joint that divides the blocks. If it weren't, there would exist the possibility of a collision (albeit at slow speed).

No, the locomotive engineer (not “driver” in North America) cannot see the signal change indications, if he is operating from the leading end of the train (which she normally does).

Jim
  by gokeefe
 
Since the original post has been answered ...

What was the origin of the "lunar" signal aspect? A restaurant that I dine at regularly has a former switchstand lantern that was once lit using acetylene or perhaps kerosene. The top of the lantern has vents that when the lantern is lit from inside form a circlet of white dots around the top.

It made me wonder if given the frequent use of lunar aspects at interlockings if there was a link of some kind to old switchstand lights.

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