Last 4020, 6030, 4440, 4455, 7810 at Waterloo Works.
I went on a Gold Key Tour yesterday & probably the coolest part was seeing these tractor. I'm trying to post some pictures but having no luck. They all had around 13 hours on each & they were supposed to be the last ones of the line. If your ever in the area you can see them on the normal factory tour also.