reverser gaps

bob_pombrio@...
 

Ok I have run into a problem on my layout where I need to have a reverser in a section.  My question is how big must the gap be?  Big enough that a wheel rolling across it does not 'bridge' the gap?  Or does it need to be long enough that a truck can fit in it?  I'm inclined to thing that it only need to be big enough for a wheel but I want to be sure before I start cutting track.

Thanks,
Bob P.

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