Original issue, US Army Technical Manual, 159 pages, size is 7 3/4" x 10 1/4", stapled, three hole punched, dated 23 February 1968.  This is not a commercial copy or print but an original issue government print issued in 1968 and republished in 1985.  This publication is titled - TM 55-2220-210-12, Operator and Organizational Maintenance for Railway Car, Guard 56-1/2 Inch Gage, 8  Wheel Domestic Service.    Publication is designed to provide information and instructions for the operator and unit maintnance repair and or maintenance requirements and procedures for this rail guard car.  

Very well illustrated using photographs and line drawings.