Thru the years, there have periodically been some great chronicle's of the railroad history....
These are a few of my favorites......
This Fascinating Railroad Business, by Robert Selph Henry, Bobbs-Merrill, 1942
The Story of American Railroads, by Stewart H.Holbrook, Crown Publisher's, 1947
Railroads of Today, by S. Kip Farrington Jr., Coward-McCann, 1949
Passenger Terminals and Trains, by John A. Droge, McGraw-Hill, 1916, reprinted by Kalmbach, 1968
The American Heritage History of Railroads in America, by Oliver Jensen, McGraw-Hill, 1975
The above are general histories of American railroads. I also have many more favorites that are specifically focused on individual railroads, on individual locomotive and passenger car manufacturer's, on individual famous trains, etc. Also many covering passenger trains in general...too numerous to list them all here....
As you can see, I haven't added any more recent coverages in general histories, as my collection is already too large for my apartment.
The books I listed are all out of print, so unless you can find them in a large library, or on Amazon, etc., is probably not much help for the OP, so I apologize for that. But if you ever do come across any of these gems, they will provide a nostalgic viewpoint of railroad history....