(svn r2239) -Fix [autoreplace]: [ 1185653 ] autoreplacing a dualheaded engine into a singleheaded engine is no longer a potiontial crash
It do have one side effect through. Now no engines are added/removed from the train anymore, so it produces "half dualheaded engines"
This will be fixed when autoreplace will get a major overhaul at a later date

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