Brio male-male connector
By Arjen Breur
Free
It's free to download
Videos
Images
Documentation
Information
Brio male-male connector
By Arjen Breur
I found that this model is a very snug fit in new (2017) wooden brio tracks, but doesn't always fit in (30 years) old tracks. I'll probably update this design to have little bit more clearance.
Free