We already build the first version, shown at Expo HispaLUG 2019 in Granollers.
Reference: https://jkbrickworks.com/roller-coaster-train/
Afterwards we tried the second version, but it has indeed problems with the 90° curves. So it was never presented from ourselves.
Reference: https://jkbrickworks.com/lego-light-rail-train/
Now we are rebuilding the suspended version. The functional prototype works, also the cladding we achieved. Now the prototype of the other compartments are under development.
Reference: https://youtu.be/JcDCvbqzr6M
Thanks again to Jason for the detail full video.
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