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?
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.