Drawing Office records of major locomotive & carriage works are a valuable reference source for historians and scratch builders.
In the UK there are many preservation projects for this purpose, NRM York(National Railway Museum), HMRS(Historical Model Railway Society) and GWS(Great Western Society) to name a few. Most interest groups serve researching and retaining original DO records, as the SDT(Somerset and Dorset Trust) and others.
UK scratch builders are spoilt for the amount of records just waiting to be explored.
Many scratch builders in the UK would love to have access to such wealth of information on American prototypes.
Are there repositories in the US for similar resource of drawings and information?