The Pennsylvania Railroad (PARR) was one of the dominant railroad carriers in the US for over a century. For auction is a rule book from the PARR, entitled "Maintenance Instructions - Inspection and Coding of Empty General Service Freight Cars". It is dated May 15, 1966. The book covers such topics as (a) cleaning and washing cars, (b) contaminated cars, (c) use of the freight car code indicator, (d) box car codes, (e) gondola car codes, (f) hopper car codes, (g) flat car codes, more.