My late fathers collection of NYC stuff

I have the sad task of dealing with my late fathers railroads collection. He worked for New York Central here in New York City as an industrial engineer since the 60s. He has plans, inventory photos of NYC stock and other NYC memorabilia. I am seeking help to determine what may be of historic value.

Probably the best and most appropriate organization to contact would be the New York Central System Historical Society.
http://www.nycshs.org/

Yes. One of the directors contacted me. Thank you. Their website says they are busy and questions should be posted here so that is what I did. It all worked out.