Added first stage of tunnel resistance functionality Adjusted size parameters from ENG file in MSTSWagon refactored names for clarity - CarWidthM, CarHeightM, CarLengthM
git-svn-id: http://svn.uktrainsim.com/svn/openrails/trunk@2770 a9f3cfff-6c41-7446-b0ca-052bd761e6eb