Possibly the most fun to design and the most challenging to build, a recessed turntable is really special in a layout. The table could be driven by a worm gear with a button on the side or turned manually. This feature tends to concentrate passing trains and young engineers may queue up while waiting to transit through the switchyard.
Four track lines require the turntable to be adjusted to permit passage, with only a single path bypassing the turntable completely. The asymmetry of the turntable restricts longer trains from rotating between track lines. Shorter trains can also be shunted to three sidings branching from the table.