For six years I worked 11:00pm to 7:00am in a rail yard guiding locomotives and throwing switches. In the winter, before a switch could be thrown, I would use a special broom to clear the switch of snow and ice so that the mating sections would meet. Stiff bristled with a putty knife or scraper on the other end, it always eventual did the job.

When the arctic blasts came down across the Canadian Plains, then sweeping across frozen Lake Erie at 45-50kph on a mid January with temps around -25C to -30C at 3:00 am while I was scraping the ice out of a group of two or three switches for a couple or three hours in an open rail yard, I would think THAT was TFC (the T is Too, and the C is Cold, but the meaning of the F seems to elude me). But at about 42 degrees North Latitude, our area is almost at the Tropic of Cancer to those of the Far North.

I reiterate, I am a wimp. ;-)