Here's a good excuse for an around the wall layout that's prototypical. This is Santa Fe's (now BNSF) La Mirada CA "circle" switching area: http://tinyurl.com/cstx3sb Could be adapted to an around the wall layout w/ alot of selective compression. And if you like GP60Ms & wide vision "shoving platforms" this is your layout. This yard handles all the switching around La Mirada & Orange County. And yes the yard is on a grade. But alas the auto transfer yard & Nabisco are now gone.