Automotive
Thanks Steve!
Boeing B-50B-40-BO Superfortress 47-118 c/n 15802, retained by Boeing as EB-50B
I had though the Convair XB36 was the only plane they tested the tracks on, but I was wrong!
http://justacarguy.blogspot.com/2016/07/the-convair-xb36-and-nb-36-and-b-36.html
