Four Michigan Central Railroad Brass Switch Keys - A&W, Fraim, Bohannan Four Michigan Central railroad brass keys. All with matched bits and stamped MCRR, one stamped M.C.R.R. all in block letters. The reverse of the hilts are marked as follows, A&W makers mark with a S, Fraim makers mark, W. Bohannan with an S (This key has a single ringed barrel and is stamped with M.C.R.R.), and unmarked reverse with an S. The Bohannan key shows more notable pocket wear, but still legible. See photos for best description.