[freebeard]

Is it that hard to include a pic?


http://justacarguy.blogspot.com/2017/09/the-inverted-locomotives-of-southern.html

Because of tunnels and "snow galleries" that protected the locomotives from snow. But it was quickly realized that when ordinary locomotives went through these tunnels the smoke, soot, cinders and heat flies back and enters the control area, blinding the engineer, and that's never a good thing.
[snip]
With this arrangement of the cabin the visibility was excellent, and smoke was no longer a problem for the crew.