The book by Victor J. Stone: Taking Stock has a complete history and complete rosters of the first batches of D&RG / D&RGW / RGW / RGS stock cars in the first chapter "19th century Stock Cars". There are a few photos plus two folio drawings. This book is long since out of print and can only been found in the second hand market. Probably at a substantial price.
good luck
Hans R. Baenziger