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I see that the prewar O-72 switch tracks have track pins on the center rails as they near the frog.  Most of the pictures i have seen, the pin is bent.  

Is the bent pin supposed to be so.

What about modern locos rolling over this portion of the switch ?  Are there any issues with center rail rollers getting fouled in this area ?

Some of the O-72 switches have molded plastic rails in this area.  What are the pros and cons of prewar and postwar designs ?

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