Note: You can find reversible track files here: https://www.thingiverse.com/thing:4063095

There are a lot of train tracks on thingiverse. Different sizes, different beveling, different levels of completeness...

Probably the most complete set out there is the "small" collection of wooden train track compatible pieces at https://www.thingiverse.com/thing:1938409

But there's a problem with it. The holes, in an attempt to be as compatible as possible with third party sets, are really big. I didn't want that, especially since I planned to make an entirely 3d printed set. But the author doesn't wish to distribute the design files so that wasn't going to work as a base.

For me the ideal set is the 28 piece set from jayftee. I also personally prefer reversible track whenever possible, as I found with decent bridging the undersides were tolerable enough. So using the excellent files from jayftee as a base I've started adding some of the odder and retired variants. Right now I'm hoping to get the full set on par with the mega set earlier but I plan to go further as time goes on.