The JLC unit this is numbered, 1524 is actually a GP7 and has no blister and has been preserved and runs in southern NJ. So I've removed the blister. I realized I do this often researching what I have and how it look. A Lionel GP 20 is anther I've done it to. Is thi a common thing. Have you guys done it. Tell you stories.
My next mod iis the end of the long hood on these is flat.