One thing you will discover as you look at "old" railroads ( It is interesting to see the New Haven placed in that category, as I am old enough to remember that railroad-- and had a cousin who was a Chief Dining Car Steward for the NH in the 1950's & 1960's) is that the history of American Railroading is one of merger and consolidation. A listing of all of the 19th Century Railroads would fill an entire book, and most of the "great" railroad names of the fairly recent past ( PRR, NYC, NH, Southern, Seaboard, Atlantic Coast Line, Norfolk- Western, etc. etc. etc.) are actually merged companies. An interesting, if lengthly, exercise would be to trace the corporate origins of today's railroad names, particularly the NS, CSX, BNSF etc. This will keep you off the streets and out of the pool halls for a significant period of time!