Hello Gamecrafters,
We've just released an update which greatly improves the issue of wheels 'sinking' into the ground when turning, or when angled. All Tyres can now handle sharp turns much more smoothly so vehicles will no longer 'snag', causing them to stop or flip over. This change does have a slight impact on trains/rails that use wheels so they may perform a bit differently now.
All the best,
The Gamecraft team