I'm hoping for the 3C+D to make fruition as well. Not only with me being an Amtrak railfanner in central Ohio, but I agree with the above that it would open up the corridor and allow a good flow of traffic through Ohio from places in NKY as well.
It would be cool to see Cincinnati Union Terminal serve another train rather than just the Cardinal, a midpoint here in Columbus for passenger rail and a point southward from Cleveland. Plus, Dayton could also benefit from a station being there as well.
I know that the 3C+D is still a long ways away from possibly happening, but it's good to dream (and yes, I have dreamed of the different rolling stock it would have too, hehe).
Columbus did have Amtrak service until 1979 and the train station here was demolished (only the columns remain--now moved to another location). A convention center now stands where the previous train station was.
There are talks that if the 3C+D comes to fruition, there would be a station inside of the convention center as a possible location.
I miss that old station as well, even to this day.
I used to ride the Pennsylvania RR "Cincinnati Limited" between NYPenn and Cincy, with a layover between it and the L&N RR to and from Nashville. For nearly all its post-WWII existence, it "piggybacked" (ran combined with) other trains east of Columbus, basically being transformed in nothing but a "Rump" service between Columbus and Cincy, starting in 1966. From that point until the end in April 1971, the "Cincinnati Limited" had become merely a coach (or two) and a sleeper tacked onto (or split from) the rear of the "Spirit of St. Louis" train at Columbus. By 1969 under Penn Central mgmt., the train was rerouted from the former Pennsy to the then-better-conditioned former NYCentral ─ London OH to Cincy, via Springfield and Dayton. The Pennsy line from which the "Limited" was rerouted (Cincinnati & Xenia Branch) now forms the Little Miami Scenic Trail. A whole lot of infrastructure has been completely dismantled and erased throughout in just a half century.
As I see it with respect to Amtrak expanded-corridor routes, Ohio in general has an array number of medium and large populated areas, all of which lie among major patterns of ground transport that have rendered them intermediate points to and from similar points outside the region. Ohio has what might be considered to hold the highest concentration of such populated areas not interconnected with passenger rail (except of course the "nightly" Cleveland and Toledo runs via trains 29-30 and 48-49) ─ each center of which has become a major "node" of ground transport activity. The state's geographic regional location and the spatial position with respect to centers outside the state perhaps have made it the most potentially viable prospect for a new network within its own right. Unlike with the Florida model of implementing such a network primarily bound within that state, Ohio could be transformed into a "Mid-Eastern" (as it were) "Epicenter", to interlace with points west, east, and at least the Central South.
That said, a few days ago, Cincinnati Local12 (WKRC-TV) headlined: "Amtrak routes connecting Cincinnati to Nashville, Chicago head to feds", (posted by American City Business Journals). "New passenger rail routes connecting Cincinnati to Chicago, Cleveland and Nashville have been submitted to the Federal Railroad Administration." Based on the latest route map(s), this probably translates to a Cincy-Indy-Louisville-Nashville path, instead of the much direct pre-Amtrak route ─ Cincy, Covington (Ky.), Walton, Louisville. So, in that respect, the report might be misleading, as I'm not aware of any direct Louisville-Cincy proposal as of yet. I do believe such a connection could have merit, but only with an already implemented 3C+D+Toledo-Detroit framework ─ at the very least with the 3C portion.