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Other than a system where you duck under a permanent board, you obviously need some form of removable section.
This can take the form of a folding section (rather like a drawbridge) or one that lifts out when the layout is not in use.
On my last layout, I started with a non-scenic section that lifted out, after I had slid the connecting fishplates out of the way. (This section was 14" wide). This meant that I didn't need to worry about electrical continuity, as contact was made when the fishplates were slid back.
This was meant to be a temporary arrangement whilst I concentrated on the rest of the layout, after which I was going to install a folding replacement section. In fact, the replacement never got made and now the layout has been dismantled in favour of a L shaped design.
Whilst I don't necessarily recommend this approach as a permanent feature, it certainly allows you to develop the layout until you are sure what you want to do on the removable section.
 

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With the temporary board I used, I just slid the fishplates into place and electrical continuity was made.
With a "drawbridge style" or a more permanent lift-out section, you will need to make electrical connection by using a male/female connector which you unplug before removing/ raising your bridging piece.
The connector ends are wired, one end to each side of the gap in the rail as you would with a section break. Remember that you need to do this for each rail ( +tve & -tve ) but you can use a 4 way connector if you want. Hope that's clear enough, if not don't be afraid to ask again - no problem.
 
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