There really isn't. Freight companies are responsible for maintaining investing in the rail, and if it doesn't make them money, they aren't going to put it there. Heck, a lot of places are single rail (meaning, no two way traffic at the same time), because it doesn't really make sense to dump more money into an extra set of tracks in those places.
The correct approach is for low latency rail freight to operate on passenger rail systems which already have the necessary speeds and flexibilities. This is structurally unfeasible in the US but it's still definitely a market that better rail systems can service at no extra cost.
And actually, sharing tracks between passenger and freight service is something that they don't really do in Europe. Because they share tracks, American passenger trains have to build at a weight on part with freight trains. Most lines in Europe separate out passenger and freight service lines so they can run lighter trains for passenger service.
Low latency freight for smaller, high value items is often done on passenger lines (or even passenger trains) because it doesn't put any scheduling pressure on passenger service.
As far as use of freight in Europe, the elephant in the room is that the EU uses a lot more sea freight than the US. Indeed, while the modal split for EU trucking is around 50%, it's around 70% in the US, and it thus seems clear that the real reason that there is less rail shipping within Europe is because there is much more competition from maritime shipping.
And since trucking capacity has been maxed out in the US for quite a while (Amazon is the big mover for this situation, even before covid), you can bet this path dependence is biting us now.
Happens a lot in Switzerland.