They are 10 1/2" high and 7 1/2" wide. see photos.
Chicago & North Western RR Chicago St Paul Minneapolis & Omaha Safety Rules 1944
Large Locomotive Wrench Chicago St. Paul Minneapolis & Omaha RR C St P M & O Ry
Chicago Saint Paul Minneapolis Omaha Railway Annual Report 1927 Train Ephemera
Chicago Saint Paul Minneapolis Omaha Railway Annual Report 1924 Train Ephemera
c.1915 Chicago St Paul Minneapolis & Omaha Railway Examination Brakeman Flagman
Postcard UDB RP Chicago St Paul Minneapolis & Omaha Alco 326 No Buyers fee TR040