Heads up! This lamp can be seen on the Ebay link below. Bidding is going hot and heavy. A photo is shown with the lamp featured on a Chicago South Side Rapid Transit locomotive. I don't mean to fuel the fire for the sellers. If any restorations need one of these, this might be a way to contact the seller/purchaser to get some dimensions in order to have a replica made up.

Star Locomotive Headlamp