In a wonderful photo posted to the CSX “Cap, Met, and OML” subs, Railfans Facebook group by Ray Soderberg, we have a look at the track arrangement at the water treatment plant ca May, 1974. This arrangement was implemented when the facility underwent various upgrades.

For me, it was a real eye-opener. I had never seen this arrangement and it is really cool to see. Remnants of the unloading facility (where the tank car is spotted in the distance, in the center, are still there today: https://goo.gl/maps/PEi6kpCXfrbBcssu9