It seems like the firebox would have created a great deal of heat. It was probably hated by engineers and coal shovelers who had to be in the front compartment in warm weather. It may have been something as simple as a canvas flap in the winter. But as temperatures went down, like autumn, the cool air was likely welcomed.
I agree. But any kind of wind at sub-zero F temps quickly removes heat in any kind of space.
As for the cars being pulled, they had to have something like canvas flaps, and it seems they would have had wood or coal burning heaters installed in the passenger cars. Hobos must have simply endured the cold...with the cows and pigs.
aye, cows and pigs = heat!
My understanding is that on the freights, the caboose was heated with a wood stove, which wasn' always the best thing since the cabooses were made of wood.
I'm associated through another hobby with a guy who is a hard core member of the Silverton-Durango railroad club in Colorado, and he would know for sure.
See! Both you and MamaG have kept BGF's rep as THE palce to come for answers!