When it was not easy to turn them around, and they knew that the car would need to return to its original location, they had to build with two engines, so it doesn't overheat from driving backwards long distance.... as the radiator needs the airflow to keep the engine cool. I just learned this from Johnny at Steampunk vehicles!
It occurs to me that, particularly in the case of NZ's timber railways, it can be awful handy to have two engines applying their traction to the rails... and if one breaks down you still get home- useful for very remote logging operations.
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