I've got an actual photo of -40 and brought it in to the sob boss I worked for at the time. Didn't help, he only said now I know you can make it to work when its that cold!
I'll never forget that day I was near Ralph, MI. I had put cardboard in front of the radiator in the truck but still about froze. Had the radio on and they said it was -52 in Ralph. I think Iron Mountain was -48. I never shut the truck off that day and heater on full blast. Let us just say I was very happy to get home and thaw out.