Often I see sellers on auction sites listing vintage O-72 Gargraves switches and calling them O-100. here is a photo of the three switches which get confused. A vintage GarGraves O-72 at the bottom an original O-100 middle with center rail between the points formed from rail bent into a sort of elongated diamond and a current O-100 top, with a stamped sheet metal center rail between the points much like that on the O-72. Other small details distinguish the three. The current O-100 has extended ties at the throw lever and the molded tie base is two ties longer than the other two. The original O-100 and the O-72 share the same molded tie base but the points and throw lever are in different locations. The O-72 has 5 ties between the throw lever and the end of the base where the original O-100 has only 2 ties between the throw lever and the end of the base. I would love to know the beginning and end of production runs for the original O-72 and the original O-100 should anyone know as well as anything else I may have missed. I have also marked the span of the arc on all three with a blue. Another small detail about the GarGraves O-100 switches is GarGraves site states these are 100" radius switches not 100" diameter. One last point the new GarGraves O-72 switches have an arc on the turnout that extends from one end of the switch to the other.
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