Hard to say, projecting what might have been with what actually happened is chancy business, at best. Had the N&W/Chessie merger happened, a lot of the railroad map in Ohio and Indiana would look a lot different today. Would the combined system have routed all the coal to Presque Isle in Toledo, doing away with the old PRR facility that the N&W and now NS uses in Sandusky, OH, and indeed, would the Sandusky District (old PRR) between Columbus and Sandusky still be there? Rumor was, back when merger discussions were being held, that a connection was to be built at Marion, OH, and the Sandusky District downgraded north of Marion.
Likewise, the Cincinnati District of the N&W between Portsmouth and Cincinnati would have disappeared long ago, with traffic routed to the C&O route along the Ohio River from Huntington to Cincinnati. As it is, the Cincinnati District hasn’t disappeared but it is currently served by one local and largely railbanked on the eastern end.
What would have happened to the Nickel Plate west of, say, Fostoria, would all the traffic been routed to the B&O to Chicago, making the main to Chicago via Fort Wayne superfluous? Perhaps the traffic going to St. Louis or Kansas City would have saved the route west of Fostoria, connecting with the former Wabash at New Haven, IN, or perhaps the combined system would have made a longer route by routing all traffic to the B&O at Fostoria and then to the Wabash at St. Joe, IN.
Either way, the old NKP/Cloverleaf west of Frankfort, IN, would have eventually suffered the same fate as it did.
With this merger, there would have been no New Castle District, the former PRR route out of Cincinnati, via Richmond and Muncie. Instead, there would have been eventual improvements and clearances provided for the now abandoned C&O of Indiana, and the former PRR route would have, no doubt, been abandoned, as well as a large share of the connecting NKP lines that make up th