This set was produced to introduce an more comprehensive set for these classes.
The history of the Berwind Mining Company and it's West Virginia Subsidiary, the New River & Pocahontas Consolidated Coal Company can be found in the Keystone article referenced below. These cars lasted into the Penn Central Merger era and a few even into early Conrail.
This sheet has enough data to do 14 cars, 4 GL, 6 GLa, and 2 BW-1. There are three different reweigh/repack codes to cover locations these hoppers were typically found on the coal region of central Pennsylvania. Also multiple re-weigh dates ranging from the mid-1930’s through to the mid 1960’s.
The GL Class has been produced by Westerfield in resin, however F&C's GLca can also be used as a legitimate stand-in model representing the fishbelly-side car. The GLa class of hoppers has been produced in plastic by Bowser. The BW-1 class of hoppers was produced in resin by F&C. The GL has also been done in brass by Railworks.
For references regarding the Berwind-White Mining Company and New River & Pocahontas Mining Company hopper car fleet please consult The Keystone, V19 #3, published by the PRRT&HS.
For references in regard to the PRR's GL and GLa Class Open Hopper Car fleet please consult Pennsylvania Railroad Steel Open Hopper Cars, by John Teichmoeller and Volumes 1-3 of the PRR Color Guide.