Corrected errors in MSTSDieselLocomotive.cs that resulted in errors in trailing units that were copied from the lead unit, so that exhaust appears correctly. Corrected error in DieselEngine.cs that caused exhaust and idle rpm to oscillate.
git-svn-id: http://svn.uktrainsim.com/svn/openrails/trunk@1928 a9f3cfff-6c41-7446-b0ca-052bd761e6eb