Here is a track plan drawn with a broad brush for the actual railroad tracks at and near the Houston ship channel, a track lover's paradise - not to mention a ship modeler's paradise:

Tank car loading requires an even number of tracks; hence, a slight change frees one turnout that I placed in mainline to lead to junkyard perhaps.

Preparing for the Temple, Texas, Train Show

I like these photos so much that I shall post all of them until I can pick the two or three best.  The first seven were supposed to be a panorama, but only the first two worked to give Panorama 16.  I like the way tired old Instant Horizons was so effective in these photos.

Slightly better renderings

This might make it easier to visualize.  The details of the upper-level track are very much up in the air.  (Word play for John Hunt)  However, I bought half-inch plywood for  the roadbed yesterday.

Here is yet another version - probably the last before I cut the roadbed:

The high-level track should be in the center, the low-level track near the edge.

All graded track is on the left-hand (mountain division) table.