They look like re-railers to me John. In UK practice we used to build our own using plastic card and use them in what we called “fiddle yards” (Areas of track where the stock and locos were swapped over). They make it fast and to put stock on the track. You just slide the wagon or whatever across the railer and the wheels are aligned with the rails.
UK homes rarely have this much space, so the usual idea was build the interesting bit, such as a station (usually a terminus rather than a through station) and swap out stock in an “off stage” area so you can vary the trains running into the station.
As an illustration, this was the last one I worked on....It was a club layout, and I made the big warehouse in the background....never did get around to the windows.
Both ends of this had fiddle yards to vary the stock.
Sorry to hijack this a little Paul, I’ll delete it if you want.