The file 'H0 Stone Bridge Support 3D Printer Model' is (3mf,stl) file type, size is 66.9KB.
A stone bridge-support, designed to fit bridge sections 55mm wide (although you can resize this easily enough for different widths and heights).
Pictured supporting this: https://www.thingiverse.com/thing:261343
I made this by resizing the original and subtracting away some cubes, leave a comment if want to know more. I've included the original 3MF file in the downloads - I edited this using Microsoft 3D Builder (free).
BridgePillar-FitSteelBridge.3mf | 37.5KB | |
BridgePillar-FitSteelBridge.stl | 73.2KB |