I'm trying to come up with a layout for my small yard (HO Scale). The track that passes by on the top is for the Santa Fe and SOO Line railroads - pretty much used for access to the yard only (an hidden express route will eventually travel underneath the yard in the final layout). The ROCK trackage is much more significant in the layout I'm working on now, and will have the majority of traffic for the foreseeable future. I was thinking of a yard that was parallel to the ROCK line, with links to the Santa Fe line, and a caboose track in the top right corner, but I thought I'd pass it to the group for thoughts as well. The diagram represents about four feet left-to-right (edge of pic on left, to the top of the ROCK loop), and about 2.5 feet top to bottom (where the ROCK spur ends). There is considerable wiggle room left, as none of this has yet been constructed.