The Dearborn factory required a large power generation facility and, in days gone by, this was provided by a large steam engine driving generators.  This machine is now nicely preserved.  The scale of it is a bit hard to represent.  The cylinders are huge and the controls are substantial.  You can climb up on top of the whole thing to see how it went together.  Surprisingly, this is not a place that was getting too many visitors which meant I was able to nose around in relative peace.  It is hard to imagine what it would have been like when this enormous piece of engineering was in use and was generating the power for the plant.  Now it is idle but it still looks imposing.