Older rolling stock design would use 2 wheels on one axle. The test in the code would change the offset, but turns out the initial change is not enough leaving the wheels and bogie to jump around. Changing the offset fixes this.
git-svn-id: http://svn.uktrainsim.com/svn/openrails/trunk@3024 a9f3cfff-6c41-7446-b0ca-052bd761e6eb