Railroad Forums 

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  • 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

 #1301579  by urrengr2003
 
Which signal came first; the Type SA or SC? They both furnish the same aspects but one uses a polarized armature and the other a pair of magnets to drive the mechanicism. What was the intendend application for the different types?
 #1301603  by Freddy
 
urrengr2003 wrote:Which signal came first; the Type SA or SC? They both furnish the same aspects but one uses a polarized armature and the other a pair of magnets to drive the mechanicism. What was the intendend application for the different types?
There's a facebook page I'm a member of, Railroad Signals. You can join and they'll tell you. Pretty laid back over there.