The #6 Custom lines (#564) have a standard short length diverging route.http://www.nhshobbies.com/product_p/atl564.htmThe #6 (505) have a diverging route that is as long as the main route.http://www.nhshobbies.com/product_p/atl505.htmThe geometry is the same for both turnouts. The diverging route length is different and the 505 has a throw bar that is a little more heavy duty and extends out both sides of the turnout. The custom line throw only extends out one side and is a little flimsy.You probably want to use the custom lines with the shorter diverging route for a ladder.
trying to aquire some materials to start ,hit a snag on #6 switches atlas makes two types a563 custom line & a 505 whats the diff. and whats recomended....want to put a ladder syle yard in ....and probable dcc any help ..many thanks