Most direct does not necessarily translate to fastest. I see nothing wrong with the Lake Shore Limited's route.
One answer would be the much-discussed revival of service more or less on the route of the
Broadway Ltd. If we took a poll here, this would be almost unanimous answer to the question, "What new LD train should Amtrak add first?" Even folks opposed to extending the LD system can see this one as overlapping corridors laid end to end: CHI-TOL, TOL-CLE, CHI-CLE, CLE-PGH, PGH-Harrisburg-Lancaster-Philly, among others.
Presumably such a train would have you sleep thru the empty of Western Pennsylvania, allowing it to bring daylight service to PGH, Youngstown, nearish to Akron n Canton, CLE, and TOL, nearish to Detroit. And this is a route fat with population. So it looks like a sure winner. But NS is already squealing about proposals to add a second frequency just Harrisburg-PGH, and the route gets more congested the closer it gets to CHI.
Another alternative would be a second train on the
Lake Shore's flat, "water-level" route. Can we do both? We already have the needed train NYC-ALB-BUF. But from Buffalo west is some of the most crowded freight tracks in the U.S. CSX carries the
Lake Shore to Cleveland, then it's on NS into Chicago. They will both do everything they can to keep another passenger train off these main lines.
The All Aboard Ohio site states matter-of-factly that CSX was strongly opposed to the 3-C's route (Cleveland-Columbus-Cincinnati). So the company went to John Kasich when he was running for governor back in 2010, and persuaded him to attack, and then kill, the 3-C's plan.
Without investing a pile of money into dedicated passenger-train-only tracks, it's just not going to happen.
Much investment is poised to happen, but every project could use a big push.
Step 1. In ChicagoLand, a Billion or Two would finish up some big CREATE projects, and speed up all trains from Union Station to the Indiana border.
Step 2. Then the South of the Lake plans extend from ChicagoLand to Porter, IN, where the Michigan trains peel off toward the north on existing 110-mph track. SOTL is a bit delayed: "The Final Environmental Impact Statement/Record Of Decision is targeted for completion by the summer of 2016. The Service Development Plan is also underway and will be completed by summer of 2016." Yeah. Then we'll need to find maybe $2 Billion to do the work, "incrementally", they say, to spread out the funding problem. Anyway, on that faraway day when SOTL is completed, the
Capitol Ltd. and the
Lake Shore will each enjoy almost an hour shaved from the run time.
Step 3. Extend 110- or 125-mph track from the split at Porter to Cleveland and then Pittsburgh. Back in 2004, the Midwest Regional Rail Initiative estimated that with appropriate upgrades the then-travel time CHI-CLE of 6:24 could be chopped down to 4:22. The plan proposed 6 daily corridor trains in addition to the current 2 LD trains. (Since then, discussion of maximum speeds elsewhere seems to be migrating from 110-mph toward 125 mph, making even faster schedules possible.) Then the Ohio Hub plan added another 6 or so corridor trains CLE-DET.
So breaking it down, after CREATE and SOTL take an hour out of the schedule, upgrade Porter-TOL-CLE to take another hour out. That way, CLE moves 2 hours closer to CHI. What to do? Later departures? Earlier arrivals? It's all good.
Back to the Midwest Regional Rail study, source of these time savings estimates, it expected $1.2 Billion in 2002 dollars to pay for all the needed upgrades CHI-CLE. Consider inflation, how about $2.4 to $3.6 Billion in today's dollars. Looking at what STL-CHI is costing and gonna cost, $4 Billion will barely be enuff. But wait! CREATE and SOTL will likely cover half of that, leaving about $2 Billion needed for the much longer Porter-TOL/DET-CLE stretch.
Of course, the upgrades for 4 1/2 hour service CHI-CLE will increase capacity with an added track all along the way.
Continuing east, another half Billion at least to upgrade CLE-Youngstown-PGH. The Ohio Hub study concluded that tweak in the routing would bring more riders. Then PGH-Harrisburg; well, Pennsylvania is working on that.
At some point, with mostly dedicated passenger train only tracks between NYC-CHI, adding more passenger trains, like the
Broadway Ltd will be easy. And by then Amtrak could have enuff equipment to do this.