The Pawnee tug at Benalla has been running with a Chev V8 for years now and much cheaper to run/replace than original.
I seem to remember that the 'autotug' was touted by GFA to be really something, but suddenly all development ceased and the project stopped with just the one example.
kaz3g; You got any info on just what transpired with that project? And why it has not proceeded?