The plate is a piece of hardware that was used for identification purposes.
PRR Pennsylvania Railroad Brass Property Identification Oval Plate
Burlington Northern Railroad Brass Property Identification Oval Milk Can Tag
CSX Railroad Aluminum Property Identification Oval Plate
CN Canadian National Railroad Brass Property Identification Plate
PB&W Philadelphia Baltimore & Washington Railroad Brass Property Plate
PRR Pennsylvania Railroad Brass Motor Car Inspection Builder's Plate
