Here we have an Instruction Pamphlet U5031 Style A1 Electro Pneumatic Switch Booklet. February 1931. Installation And Adjustment Of Style A1 Electro Pneumatic Switch And Lock Movement And CP Switch Valve. Union Switch & Signal Co Swissvale PA. It has 43 pages. It is approx. 7" tall x approx 5" wide. It is in good condition. It does have some wear and imperfections. See the photos or more info.