If you have any postwar cars or locomotives with electrocouplers (GG1's, 2333/43/53 F-3's, etc.) you may find that the couplers open when crossing a Gargraves switch. The slide shoe makes contact with the stamped metal center rail wedge on the switch and opens the couplers. I strongly suggest buying or borrowing one switch, connect some flex track to it, power the track and run your postwar stuff through it to see how it works for you.
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