This set was produced to introduce a more comprehensive set for these classes, which hadn't been done by previous manufacturers.
The PRR's Y4 Scale Car was a standard 80,000 lb. design, which has been made available in Brass, from Overland and Hallmark, in addition to a limited run cast metal kit from Stewart Products and in plastic from Walthers.
This sheet includes enough decals to decal two cars. The set includes 4 different car numbers with the correct build dates for each number. There are three different lube dates and one set without a lube date for decaling for an earlier era. Also, from referring to photographs, additional lettering has been included for modeling post-1960's cars and additional detail lettering with special instructions, which can be modeled and added to you model.
For references in regard to the PRR's Scale Car Fleet, please consult The Keystone, V10 #3, published by the PRRT&HS and Volumes 1-3 of the PRR Color Guide.