I will second the thought on a through yard.The stub end yard in most cases is not worth the hassles.You see it blocks your locomotive..You will need to add a crossover for engine escape or back in your yard or back out of your yard to head in the other direction and who wants to do that?
Better still is a open ended yard(through yard) where you can enter the yard for either direction without the hassles of backing in or out to your main line.Plus you can work your yard from either end which is another plus.This type of yard is preferred by advanced layout planners.
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CS asks:If I built the yard in place of the turn table wouldn't that be breaking one of the commandments of yard building?
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Indeed not at all! You said you like GP38s and GP40s..Good! With these units you will have no need for a turn table as these are bidirectional units..Also recall the real railroads has removed most of their turn tables as they are no longer needed with diesel locomotives.
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Comment:One of the most common layout designing errors is that layouts need turn tables.Turn tables and stub end yards is old school thinking that should be dismissed as outdated layout designing with the exception of using steam locomotives then of course you will need that turn table..
As far as yard "commandments" I will suggest you file those under "T" for trash can as I would like to do with the bozo(s) that came up with those silly commandments who more then likely never built a layout or knows anything about real railroads in general .
