Yes, it is an Imperial German Boxcar eagle plate, to designate that the boxcar is part of the Imperial German Railway System (K.P.E.V., as shown on the wikipedia link by Michel/member "morel5000"). It was mounted towards the front of the side of the boxcar. Here's a photo of one in use.
I have one of these myself, which was brought home by a local vet, Major Frank Snyder, of Jewel, IA.
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