I’ve always thought they were called Cab Sun Shades. Anyway, thousands of locomotives are equipped with them.
It’s for the crew’s comfort so just like the sun visor inside of your car, cab shades are also movable. So on your locomotives whether you have both up, both down, or just one up…it’s correct. You can’t go wrong.
You can go to http://www.railpictures.net and see thousands of photos of American diesels. Plenty of cab shade shots.
Antonio, cab wind deflectors are at the side of the windows. Some of them even have rear-view mirrors. I can’t say I’ve seen them used much though, they’re usually folded against the cab. The parts are available from Detail Associates (see Walthers).
Although here’s a shot of a UP engine with them in the “out” position (and the sunshade in the “up” position):
They can be either or both. Actually, the one in the photo I posted is more acurately a rear view mirror doing double duty. Some have only the bottom third as a mirror.
Ooops! Sorry about that! As many years as I’ve been in this hobby I didn’t realize that this was the purpose of those plates. I actually thought they were for rear view mirrors, I have a photo of an SDP40f with one on the engineer’s side.