- where you want,

- when you want,

- carrying what you want,

- as fast

- and as safely as possible,

- at the lowest cost possible.

Trains are weak on multiple axes here: they do not go where you want to go and they do not go when you want to go, and you cannot carry large amounts on them. They are also quite slow.

The only reason that anyone uses trains is because in dense urban areas like London, cars are even slower, and for intercity trips it is both slow and hard to park when you get to the destination city. There are perhaps some exceptions to this but they don't really exist in the West. Really fast intercity trains are a thing in China and Japan, but the UK has no trains that take you from A to B at an average speed greater than a fast car once you take waiting and stopping time into account. As far as I am aware the same applies to the US as well.

Trains do not cover 90% of use cases, they cover maybe 10%. In my opinion, trains are a technology that should be completely scrapped in favor of driverless minibus and driverless car networks. Modern electric & driverless vehicles with internet connectivity and global transport optimization like Uber would beat trains on every single axis.