This set includes two ramps and a trestle style support for building elevated tracks. The ramps are a bit too steep so most trains with scrape a bit when going up or down. But I wanted to make the ramps tall enough that trains could fit underneath them and this is the best I could do with the Prusa Mini bed size. Perhaps the next iteration will have a two-part ramp at a lower angle.
All parts can print without supports. No issues at all with the ramps. The trestle supports can be a little tricky. Printing them one at a time and using a brim around each foot I've had good success. I tried to print two at a time without any brim and had some failures.
The author hasn't provided the model origin yet.