As ever, memory was playing tricks. It would seem it came with a job lot that I once purchased. Having dug it out, it's a simple sheet of steel, 600mm long, pressed into a suitably tapered profile (high to low and wide to narrow) where the bottom edge has a centre depression that fits neatly between G scale rails (to which I have added insulating tape in case it needs to be used while the rails are powered). That channel is wider at the top so that rolling stock can be placed anywhere in the wider part of the channel and it just rolls off the bottom onto the rails. How suitable it would be for long locos with wheels that don't freely rotate is less clear but presumably they could be pushed down it with the same effect.
The good news is that there is a label on the underside saying where further examples could be bought. The bad news is that the most recent online reference to that name and address (for aids to build three-rail O gauge pointwork!) dates from 2010 . . . so it seems very unlikely that they can still be bought.
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Now, who knows someone with a metal fabrication business???
Sorry! Just noticed this topic is in the 3D Printing section, so my apologies for dragging it in a different direction.
Cheers
David
