Thanks Joe for confirming that. One thing though is the intermodal yard I have. It kinda looks out of place now, so I might get rid of the concrete rails (stryene) and just use yard ballast on those two intermodal tracks. Also this way I can store other rolling stock other than double stacks.
I was at Morrisville, PA, when the Trailvan terminal opened, back in 1982, the outer tracks were ballasted, and the trailer yard was compacted stone and clay mix. When it became necessary to add an adjacent track, the MW just paved the existing track by spreading more of the crush and run mix on it. South Karny, NJ was mostly paved with blacktop, but the rails were normally ballasted with crossings at strategic locations. If I were doing an intermodal yard, I would pave it with cinders, while ballasting the tracks with fine ballast. Tractors, trailers and piggypackers wreak havoc on any kind of paving, and railroads are by nature cheap, so something cheap and easy to repair might look better.
Looking at your intermodal yard, from the photos, I would leave it as is.
You may want to over spray it with grimy black or similar to simulate black top paving, vs concrete, and if you can remove the 'paving from the tracks themselves, and ballast them you can, but I'm not sure it would make that much difference. Several stacks of containers, and trailer storage might help the effect you are looking for, but that's up to you. My rule is It has to look right, not necessarily accurate but right. For the most part you are very close to that right now.
Joe