RAILforum: What is this?

This is topic What is this? in forum Commuter Trains at RAILforum.

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Posted by vdsteelman (Member # 4497) on :

Now that there are knowledgable people on this site, my questions are gonna keep coming! In regards to this picture:
http://www.railpictures.net/viewphoto.php?id=142472

What is the instrument on the windshield right above the horn lever? I've noticed this thing on almost every new loco and have not been able to find out what it is.

Thanks once again,

Ben