I grew up near the NYC main now operated by CSX in Erie and interested in purchasing a book of the history of the NYC, which would you recommend?
A good comprehensive history of all subsidiaries is The Road of the Century by Alvin F. Harlow, Creative Age Press, Inc., 1947.
A good one for the LS&MS is The Lake Shore & Michigan Southern Railway by Dave McLellan & Bill Warrick, Transportation Trails, 1989.
Both are probably out of print but can probably be found on eBay or Amazon.