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Unless you're going for a full prototype scaled layout, respacing the plainline sleeper spacings is not worth the effort. The spaing used by peco is closer then it should be, but then again the small, meduim and large radius turnouts are way shorter and of a greater crossong angle then anything you will found in mainline use in the real world. Once both are installed and ballested up, they look the part.

True prototype 4mm scale turnout and point work is huge. Unless you've got in excess of 4 foot to devote to a simple crossover, stick to the stock peco 'out of the box' stuff...
 

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Its not so much a case of being conterproductive or less realistic. It's more of a case of space.

As I mensioned above, the tightes radius turnout you will find on a main line is a CV-9.25. These have a lead of 25.025 metres and turnout raduis of 245.75 metres. In 4mm scale thats 329mm between the switch tips and the nose of the crossing, and a 3.2metre radius. Taking these dimentions a simple crossover (two turnout sat back to back to allow rains to swap between two paralell tracks) would measure 870mm between switch toes.

Most of us don't have the space to use anything near to true scale point work - Unless you're got a very large garden or an aircraft hanger to build you layout in...
 
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