To add to Rail Reading's response, you can also elevate that platform off the deck by using the "Grade/Set Track Height" option on the filled rectangle object. You can also make that rectangle a 3D object by "extruding" it using "Action/Extrude" or setting a "Z" dimension under the object's properties. I created a full rendering of the Redlands Depot (The depot with the passenger shelter with the columns) using filled rectangles and circles extruded and set to various grade heights. It's capped with a plain building object that was extruded to a smaller height (1.5" as I recall.)
![16.0x2.8_Free-Mo__Redlands_Depot_Area--Tapered_Ends 16.0x2.8_Free-Mo__Redlands_Depot_Area--Tapered_Ends](https://ogrforum.com/fileSendAction/fcType/0/fcOid/9595974434787014/filePointer/9595974437978814/fodoid/9595974437978810/imageType/MEDIUM/inlineImage/true/16.0x2.8_Free-Mo__Redlands_Depot_Area--Tapered_Ends.jpg)