My son built the simple device shown below according to instructions he found on the following website:
https://makezine.com/projects/sound-card-oscilloscope/

If you are one of the handful of people that watched the video on my rotary dumper, you will remember that annoying bit of twisted wire going the trolley in the indexer that provided power to raise and lower the arm to move the train.  I've been trying to think of a way to make that part look better. The prototype uses a festoon cable system.  Basically, it's a track about 10' or so above the ground with little carriages on it and it supports the electrical cables that go to the trolley on the indexer.

This is part of a freight dock from a Campbell kit. I went with the wood dock included in the kit instead of coming up with a more modern cement dock.

Started out with a color that I hoped would be similar to red seen on wood decks these days. That turned out to be a variation of orange. Added some basic brown dry brushed some flat black and then the same with a light grey.

I have become enamored with the flowing look of track built on spline roadbed. While I model in On30, the track gauge is the same as HO, it does require longer ties and more center to center spacing. With that in mind I lowered a section of my bench work about 4” below where the other, plywood, roadbed is already in place to allow a few more riders and some room for scenery below the track level.